chore: add a readme

Author: TomDotBat

README.md

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+# AutoToot
+A mod that makes Trombone Champ play itself.
+
+## Additional Features
+- Supports TrombLoader maps
+- Toggleable with the F8 key
+
+## Usage
+1. Place the mod in your BepInEx plugins folder (view TrombLoader's BepInEx installation instructions [here](https://github.com/NyxTheShield/TrombLoader#installation)).
+2. Open up the game and play a map of your preference.
+3. Use the `F8` key to toggle AutoToot.