Add contribution guidelines and GitHub templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: Report a bug or unexpected behavior in Chartifact
+title: "[Bug]: "
+labels: ["bug", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill out this form as completely as possible.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of what the bug is.
+      placeholder: What went wrong?
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: Detailed steps to reproduce the behavior.
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+      placeholder: Describe what you expected to happen
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+      placeholder: Describe what actually happened
+    validations:
+      required: true
+
+  - type: textarea
+    id: document
+    attributes:
+      label: Sample Document (if applicable)
+      description: If the bug relates to a specific document, please provide a minimal example (JSON or Markdown)
+      placeholder: Paste your .idoc.json or .idoc.md content here
+      render: json
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Please provide information about your environment
+      value: |
+        - OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]
+        - Browser: [e.g., Chrome 120, Firefox 121, Safari 17]
+        - Node.js version: [e.g., 20.10.0]
+        - Chartifact version: [e.g., 1.0.0]
+        - VS Code version (if applicable): [e.g., 1.85.0]
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots or Screen Recording
+      description: If applicable, add screenshots or a screen recording to help explain the problem
+      placeholder: Drag and drop images or paste links here
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Console Logs or Error Messages
+      description: Please include any relevant console logs or error messages
+      placeholder: Paste console output here
+      render: shell
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here
+      placeholder: Any additional information that might be helpful
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Pre-submission Checklist
+      description: Please verify the following before submitting
+      options:
+        - label: I have searched for existing issues to avoid duplicates
+          required: true
+        - label: I have provided all the required information above
+          required: true
+        - label: I can reproduce this issue consistently
+          required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 💬 Discussions
+    url: https://github.com/microsoft/chartifact/discussions
+    about: Ask questions, share ideas, and engage with the community
+  - name: 📖 Documentation
+    url: https://microsoft.github.io/chartifact/
+    about: Browse the official Chartifact documentation and examples
+  - name: 🔒 Security Vulnerability
+    url: https://github.com/microsoft/chartifact/security/advisories/new
+    about: Report security vulnerabilities privately (do not use public issues)

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: ✨ Feature Request
+description: Suggest a new feature or enhancement for Chartifact
+title: "[Feature]: "
+labels: ["enhancement", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a new feature! Please provide as much detail as possible to help us understand your request.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: Is your feature request related to a problem? Please describe the problem you're trying to solve.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like to see
+      placeholder: A clear and concise description of what you want to happen
+    validations:
+      required: true
+
+  - type: dropdown
+    id: component
+    attributes:
+      label: Component Area
+      description: Which component or area of Chartifact does this relate to?
+      options:
+        - Document Schema
+        - Runtime/Sandbox
+        - VS Code Extension
+        - Web Viewer/Editor
+        - Text/Markdown
+        - Charts (Vega/Vega-Lite)
+        - Tables (Tabulator)
+        - Inputs (Forms)
+        - Diagrams (Mermaid)
+        - Images
+        - Presets
+        - Data Sources/REST
+        - CSS/Styling
+        - Documentation
+        - Examples
+        - Build/Tooling
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered
+      placeholder: What other approaches have you thought about?
+
+  - type: textarea
+    id: examples
+    attributes:
+      label: Examples or Use Cases
+      description: Provide examples of how this feature would be used
+      placeholder: |
+        Example 1: ...
+        Example 2: ...
+
+  - type: textarea
+    id: mockup
+    attributes:
+      label: Mockups or Design Ideas
+      description: If applicable, add mockups, wireframes, or code examples
+      placeholder: Drag and drop images or paste code snippets here
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority
+      description: How important is this feature to you?
+      options:
+        - Nice to have
+        - Would improve my workflow
+        - Important for my use case
+        - Blocking my use of Chartifact
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context, screenshots, or references about the feature request
+      placeholder: Links to similar features in other tools, research, etc.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Pre-submission Checklist
+      description: Please verify the following before submitting
+      options:
+        - label: I have searched for existing feature requests to avoid duplicates
+          required: true
+        - label: I have provided a clear description of the problem and solution
+          required: true
+        - label: This feature aligns with Chartifact's goals as a declarative, interactive document format
+          required: false

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Provide a clear and concise description of your changes -->
+
+## Related Issues
+
+<!-- Link to related issues using "Fixes #123" or "Relates to #123" -->
+
+Fixes #
+
+## Type of Change
+
+<!-- Mark the relevant option with an "x" -->
+
+- [ ] 🐛 Bug fix (non-breaking change which fixes an issue)
+- [ ] ✨ New feature (non-breaking change which adds functionality)
+- [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] 📝 Documentation update
+- [ ] ♻️ Code refactoring (no functional changes)
+- [ ] 🎨 Style/formatting changes
+- [ ] 🧪 Test additions or updates
+- [ ] 🔧 Build/tooling changes
+
+## Changes Made
+
+<!-- List the specific changes you made -->
+
+- 
+- 
+- 
+
+## Testing
+
+<!-- Describe the testing you've done -->
+
+- [ ] I have tested these changes locally
+- [ ] All existing tests pass
+- [ ] I have added new tests (if applicable)
+- [ ] I have manually verified the changes work as expected
+
+### Test Details
+
+<!-- Describe how you tested your changes -->
+
+## Screenshots/Recordings
+
+<!-- If applicable, add screenshots or screen recordings to demonstrate the changes -->
+
+## Documentation
+
+- [ ] I have updated the documentation (if applicable)
+- [ ] I have updated examples (if applicable)
+- [ ] Code comments are clear and helpful
+
+## Checklist
+
+<!-- Review and check off all applicable items -->
+
+- [ ] My code follows the project's coding guidelines
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] My changes generate no new warnings or errors
+- [ ] I have checked for security issues in my changes
+- [ ] I have not committed secrets, credentials, or sensitive data
+- [ ] I have kept changes minimal and focused on the issue being addressed
+- [ ] I have updated CONTRIBUTING.md if I added new development workflows
+
+## Additional Context
+
+<!-- Add any other context about the pull request here -->
+
+## For Maintainers
+
+<!-- Maintainers will fill this out during review -->
+
+- [ ] Code review completed
+- [ ] All CI checks passing
+- [ ] Documentation reviewed
+- [ ] Ready to merge