Add asdf-godot plugin (#383)

Signed-off-by: Marko Kungla <[email protected]>

README.md

@@ -440,6 +440,7 @@ See [Vivraan/godot-lang-support](https://github.com/Vivraan/godot-lang-support).
 
 *Other stuff.*
 
+- [asdf-godot](https://github.com/mkungla/asdf-godot) - Godot plugin for the [asdf version manager](https://asdf-vm.com).
 - [codetranslator](https://github.com/HaSa1002/codetranslator) - Translates GDScript to C# (WIP).
 - [gd2cs.py](https://github.com/kiriri/gd2cs.py) - Python script that converts GDScript code to C# (WIP).
 - [`gd-com` npm package](https://www.npmjs.com/package/@gd-com/utils) - Communicate with Godot clients using Node.js.