Create CONTRIBUTING.md

Author: Lexedia

CONTRIBUTING.md

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+## How to contribute?
+1. Clone the repo
+2. cd
+3. Use the `shell.nix` file, or use some other shenanigans, i dont care.
+
+### Subfolders:
+- `app` :
+  - `pnpm i && wrangler dev`
+ 
+- `api` :
+  - `pnpm i && tsc && node dist/index.js`
+ 
+I don't really enforce a branch naming convention, but please, refrain from making a PR if you have pushed your changes on the `mistress` branch.
+Same with commits, just make them readable and understandable at first glance.
+
+Submit your changes!
+
+Tysm <3