Add Contributing.md

CONTRIBUTING.md

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+# Contributing to Ren Browser
+
+I welcome all contributions to the project.
+
+## Places to help out
+
+- Styling/Design (I am bad at this)
+- Documentation
+- Micron Renderer/Parser
+
+## Rules
+
+1. Be nice to each other.
+2. If you use an AI tool that generates the code, such as a LLM, please indicate that in the PR.
+3. Add or update docstrings and tests if necessary.
+4. Make sure you run the tests before submitting the PR.
+
+## Testing
+
+To run the tests, use the following command:
+
+```bash
+poetry run pytest
+```