docs: add bgms issue templates, defer config.yml to backlog

Author: MaartenMarsman

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report something that is not working as expected.
+title: ''
+labels: bug
+assignees: ''
+---
+
+## What happened?
+
+Describe what went wrong. Be as specific as you can.
+
+## Which function were you using?
+
+For example: `bgm()`, `bgmCompare()`, `simulate_mrf()`, `predict()`, or one
+of the extractor functions.
+
+## Minimal example
+
+If you can, paste a short R script that reproduces the problem. Starting from
+one of the built-in datasets (`Wenchuan`, `Boredom`, `ADHD`) or simulated data
+makes it easier for us to investigate.
+
+```r
+library(bgms)
+
+# your code here
+```
+
+If the problem only occurs with your own data and you cannot share it, that is
+fine — describe the data instead: number of variables, number of observations,
+variable types (binary, ordinal, continuous), and any special characteristics
+such as missing values or low-frequency categories.
+
+If the code produces an error message, paste the full message below.
+
+```
+# error output here
+```
+
+## What did you expect to happen?
+
+Describe the result you expected instead.
+
+## Session information
+
+Paste the output of `sessionInfo()` below. This tells us your R version,
+operating system, and which packages are loaded — all of which help us
+reproduce the problem.
+
+To get this, run the following in your R console and copy the output:
+
+```r
+sessionInfo()
+```
+
+```
+# paste sessionInfo() output here
+```
+
+## Anything else?
+
+Add any other context that might help: screenshots, related issues, or
+links to documentation.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature or improvement.
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## What problem does this solve?
+
+Describe the situation or limitation that motivates this request.
+
+## What would you like bgms to do?
+
+Describe the behaviour or output you have in mind. If you have an idea of
+what the R code would look like, sketch it out — this helps us understand
+the interface you are imagining.
+
+```r
+# optional: how you picture using the feature
+```
+
+## Which area does this relate to?
+
+For example: new variable type, edge prior, sampler, extractor function,
+summary or plot method, prediction, simulation, documentation, or
+something else.
+
+## Would you like to help?
+
+No pressure — we welcome feature requests regardless. But if you are
+interested in helping out, let us know. Contributions come in many forms:
+implementing the feature, writing tests, reviewing a pull request, or
+evaluating the results. We can help you get started.
+
+## Anything else?
+
+Add any other context, references, or examples from other packages that
+illustrate what you have in mind.