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diff --git a/contracts/guardian/src/error.rs b/contracts/guardian/src/error.rs
index d770b40..0679831 100644
--- a/contracts/guardian/src/error.rs
+++ b/contracts/guardian/src/error.rs
@@ -8,4 +8,4 @@ pub enum Error {
     InsufficientBalance = 2,
     AllowanceExceeded = 3,
     InvalidAmount = 4,
-}
\ No newline at end of file
+}
diff --git a/contracts/guardian/src/lib.rs b/contracts/guardian/src/lib.rs
index 802532b..553ae0c 100644
--- a/contracts/guardian/src/lib.rs
+++ b/contracts/guardian/src/lib.rs
@@ -21,4 +21,4 @@ mod tests {
         let env = Env::default();
         let _id = env.register_contract(None, GuardianContract);
     }
-}
\ No newline at end of file
+}
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
new file mode 100644
index 0000000..c6cc7a3
--- /dev/null
+++ b/docs/CHANGELOG.md
@@ -0,0 +1,34 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [Unreleased]
+
+### Added
+- Added contributor onboarding documentation
+- Added Cargo workspace development workflow guide
+- Added Flutter setup and testing instructions
+- Added branch naming and conventional commit conventions
+- Added pull request and pre-push validation workflow
+
+### Changed
+- Improved contributor development experience and repository onboarding process
+
+### Fixed
+- N/A
+
+---
+
+## [0.1.0] - 2026-05-08
+
+### Added
+- Initial project scaffold
+- Flutter mobile application setup
+- Soroban smart contract workspace
+- Wallet and guardian contract modules
+- CI/CD workflow foundation
\ No newline at end of file
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
new file mode 100644
index 0000000..17816a5
--- /dev/null
+++ b/docs/CONTRIBUTING.md
@@ -0,0 +1,478 @@
+# Contributing to KidWallet
+
+Thank you for contributing to KidWallet 🚀
+
+This guide explains the development workflow, repository structure, setup instructions, Cargo workspace usage, and contribution standards for the project.
+
+---
+
+# Table of Contents
+
+- [Project Overview](#project-overview)
+- [Repository Structure](#repository-structure)
+- [Prerequisites](#prerequisites)
+- [Initial Setup](#initial-setup)
+- [Cargo Workspace Workflow](#cargo-workspace-workflow)
+- [Flutter App Setup](#flutter-app-setup)
+- [Smart Contract Development](#smart-contract-development)
+- [Development Commands](#development-commands)
+- [Linting & Formatting](#linting--formatting)
+- [Testing](#testing)
+- [Branch Naming Convention](#branch-naming-convention)
+- [Commit Message Convention](#commit-message-convention)
+- [Pull Request Guidelines](#pull-request-guidelines)
+- [Code Review Expectations](#code-review-expectations)
+- [Issue Workflow](#issue-workflow)
+- [Security Guidelines](#security-guidelines)
+
+---
+
+# Project Overview
+
+KidWallet is a blockchain-powered wallet application focused on secure financial access and smart contract interactions.
+
+The repository contains:
+
+- Flutter mobile application
+- Rust smart contracts
+- Cargo workspace configuration
+- Shared project documentation
+- GitHub workflows and CI automation
+
+The project emphasizes:
+- Security
+- Clean architecture
+- Developer experience
+- Maintainable contributions
+- Predictable workflows
+
+---
+
+# Repository Structure
+
+```bash
+.
+├── .github/              # GitHub workflows and templates
+├── app/                  # Flutter mobile application
+├── contracts/            # Rust smart contracts
+├── docs/                 # Project documentation
+├── Cargo.toml            # Cargo workspace root
+├── README.md
+└── LICENSE
+```
+
+---
+
+# Prerequisites
+
+Install the following tools before contributing:
+
+| Tool | Recommended Version |
+|------|----------------------|
+| Flutter | >= 3.x |
+| Dart | bundled with Flutter |
+| Rust | stable |
+| Cargo | latest |
+| Git | latest |
+
+---
+
+# Initial Setup
+
+## 1. Clone the Repository
+
+```bash
+git clone https://github.com/<your-org>/kidwallet.git
+cd kidwallet
+```
+
+---
+
+## 2. Install Flutter Dependencies
+
+```bash
+cd app
+flutter pub get
+```
+
+---
+
+## 3. Verify Flutter Installation
+
+```bash
+flutter doctor
+```
+
+Resolve all critical issues before development.
+
+---
+
+## 4. Install Rust Toolchain
+
+```bash
+rustup update
+cargo --version
+```
+
+---
+
+# Cargo Workspace Workflow
+
+KidWallet uses a Cargo workspace for managing Rust smart contracts and shared crates.
+
+The root workspace configuration is defined in:
+
+```bash
+Cargo.toml
+```
+
+---
+
+## Example Workspace Structure
+
+```toml
+[workspace]
+members = [
+  "contracts/*"
+]
+```
+
+---
+
+## Build All Contracts
+
+From the repository root:
+
+```bash
+cargo build --workspace
+```
+
+---
+
+## Run All Rust Tests
+
+```bash
+cargo test --workspace
+```
+
+---
+
+## Lint Rust Code
+
+```bash
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+```
+
+---
+
+## Format Rust Code
+
+```bash
+cargo fmt --all
+```
+
+---
+
+## Adding a New Contract
+
+Inside the `contracts/` directory:
+
+```bash
+cargo new my-contract --lib
+```
+
+Then register it in the root `Cargo.toml` if necessary.
+
+---
+
+# Flutter App Setup
+
+The Flutter application lives in:
+
+```bash
+app/
+```
+
+---
+
+## Install Dependencies
+
+```bash
+flutter pub get
+```
+
+---
+
+## Run the App
+
+```bash
+flutter run
+```
+
+---
+
+## Analyze Flutter Code
+
+```bash
+flutter analyze
+```
+
+---
+
+## Run Flutter Tests
+
+```bash
+flutter test
+```
+
+---
+
+## Build APK
+
+```bash
+flutter build apk
+```
+
+---
+
+# Smart Contract Development
+
+All blockchain contract logic lives in:
+
+```bash
+contracts/
+```
+
+---
+
+## Development Standards
+
+- Prefer explicit typing
+- Avoid panics in production logic
+- Keep contract logic deterministic
+- Write unit tests for critical logic
+- Avoid unnecessary allocations
+- Document public interfaces
+
+---
+
+## Recommended Workflow
+
+```bash
+cargo fmt --all
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+cargo test --workspace
+```
+
+Run all checks before opening a PR.
+
+---
+
+# Development Commands
+
+| Task | Command |
+|------|----------|
+| Install Flutter packages | `flutter pub get` |
+| Run Flutter app | `flutter run` |
+| Analyze Flutter app | `flutter analyze` |
+| Run Flutter tests | `flutter test` |
+| Build Rust workspace | `cargo build --workspace` |
+| Run Rust tests | `cargo test --workspace` |
+| Format Rust code | `cargo fmt --all` |
+| Lint Rust workspace | `cargo clippy --workspace --all-targets --all-features -- -D warnings` |
+
+---
+
+# Linting & Formatting
+
+Before pushing changes, ensure all checks pass.
+
+---
+
+## Flutter
+
+```bash
+dart format .
+flutter analyze
+```
+
+---
+
+## Rust
+
+```bash
+cargo fmt --all
+cargo clippy --workspace --all-targets --all-features -- -D warnings
+```
+
+---
+
+# Testing
+
+Every contribution should include relevant tests.
+
+---
+
+## Flutter
+
+Recommended:
+- Widget tests
+- State management tests
+- UI interaction tests
+
+Run:
+
+```bash
+flutter test
+```
+
+---
+
+## Rust
+
+Recommended:
+- Unit tests
+- Integration tests
+- Edge-case validation
+
+Run:
+
+```bash
+cargo test --workspace
+```
+
+---
+
+# Branch Naming Convention
+
+Use descriptive branch names.
+
+## Format
+
+```bash
+<type>/<short-description>
+```
+
+---
+
+## Examples
+
+```bash
+feat/add-wallet-onboarding
+fix/flutter-build-errors
+refactor/contract-state-management
+docs/update-contributing-guide
+test/add-contract-unit-tests
+```
+
+---
+
+# Commit Message Convention
+
+KidWallet follows Conventional Commits.
+
+## Format
+
+```bash
+type(scope): short description
+```
+
+---
+
+## Examples
+
+```bash
+feat(wallet): add biometric authentication
+
+fix(contract): resolve overflow validation
+
+docs(contributing): add flutter setup instructions
+
+refactor(app): simplify navigation structure
+```
+
+---
+
+## Allowed Types
+
+| Type | Purpose |
+|------|----------|
+| feat | New feature |
+| fix | Bug fix |
+| docs | Documentation |
+| refactor | Refactoring |
+| test | Tests |
+| chore | Maintenance |
+| ci | CI/CD changes |
+
+---
+
+# Pull Request Guidelines
+
+Before opening a pull request:
+
+- Ensure tests pass
+- Ensure lint passes
+- Rebase on latest `main`
+- Keep PRs focused
+- Update documentation if needed
+- Add screenshots for UI-related changes
+
+---
+
+## PR Title Examples
+
+```bash
+feat(wallet): implement wallet recovery flow
+
+fix(ci): resolve cargo workspace lint failures
+
+docs(contributing): improve setup documentation
+```
+
+---
+
+# Code Review Expectations
+
+Reviewers will evaluate:
+
+- Correctness
+- Readability
+- Maintainability
+- Test coverage
+- Security implications
+- Performance considerations
+
+---
+
+# Issue Workflow
+
+## Before Starting Work
+
+1. Comment on the issue
+2. Wait for assignment if necessary
+3. Create a feature branch
+4. Keep discussions technical and focused
+
+---
+
+# Security Guidelines
+
+If you discover a vulnerability:
+
+- Do NOT create a public issue
+- Notify maintainers privately
+- Never commit secrets or private keys
+- Rotate compromised credentials immediately
+
+---
+
+# Additional Notes
+
+- Keep pull requests small and reviewable
+- Avoid unrelated formatting changes
+- Write meaningful commit messages
+- Prefer reusable and modular code
+- Maintain consistency with the existing architecture
+
+Thank you for contributing to KidWallet 💙
\ No newline at end of file