Create CONTRIBUTING.md

Author: Coolguy3289

CONTRIBUTING.md

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+# Contributing
+
+Thanks for considering contributing!
+
+A few rules of thumb:
+- This repository uses PNPM.
+- Code contributions should match the existing code style. 
+    - `pnpm lint` to check the formatting
+    - `pnpm lint:fix` to fix some of the issues
+- Discuss additions/changes with us [on Discord](https://discord.gg/fJrZZ7V) before working on them.
+- Make sure to run your own instance and ensure minor/major/dependency changes work correctly.