docs: add contributing guide (#3)

Co-authored-by: Grouchly <ubuntclaw@Grouchly.tailbdd0ba.ts.net>

CONTRIBUTING.md

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+# Contributing
+
+Thanks for helping improve this repository.
+
+## Setup
+
+1. Fork the repository on GitHub.
+2. Clone your fork locally.
+3. Create a branch for your change.
+4. Make the smallest possible update that solves the issue.
+
+## Pull request guidelines
+
+- Keep each pull request focused on one change.
+- Reference the issue or bounty in the PR description.
+- Describe what changed and why it is correct.
+- Include screenshots or other proof only if they help verify the change.
+
+## Code style
+
+- Match the existing tone and formatting of the repository.
+- Prefer small, readable edits.
+- Keep markdown headings short and consistent.
+- Avoid unrelated changes in the same pull request.
+
+## Before you submit
+
+- Re-read the bounty or issue instructions.
+- Verify the file renders cleanly on GitHub.
+- Double-check that the PR title clearly describes the change.