Merge pull request #108 from Universal-Debloater-Alliance/docs/contributing

docs(contributing): add `CONTRIBUTING.md`

CONTRIBUTING.md

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+# Contributors Guide
+
+## For who is this guide?
+
+This guide is meant for users who want to contribute to the codebase of Universal Android Debloater, whether that is the application code or the JSON-file for adding packages. To keep all processes streamlined and consistent, we're asking you to stick to this guide whenever contributing.
+
+## What are the guidelines?
+
+As for our branching strategy, we're using [Trunk-Based Development](https://trunkbaseddevelopment.com/#one-line-summary).
+
+In short, there's one trunk branch named `main` (also known as `master`). Apart from `main`/`master` there can be different short-lived branches, such as:
+
+- Features (`feature/*`)
+- Fixes (`hotfix/*` or simply `fix/*`)
+- Dependency updates (`deps/*`)
+- Etc.
+
+Do mind that these branch names do only not apply to the addition of packages; for that, we use the following scheme: `[issue number][issue title]`. This can be done [automatically](https://docs.github.com/en/issues/tracking-your-work-with-issues/creating-a-branch-for-an-issue) too.
+
+This is how it looks like and works:
+
+![Trunk-Based Development](https://trunkbaseddevelopment.com/trunk1c.png)
+
+As for commits, we prefer using [Conventional Commit Messages](https://gist.github.com/qoomon/5dfcdf8eec66a051ecd85625518cfd13). When working in any of the branches listed above (if there's an existing issue for it), close it using a [closing keyword](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword).
+
+When creating a PR, please make sure your changes are documented clearly.