Merge pull request #94 from codingthat/add-itch-io

Add itch.io to `RESOURCES.md`

Author: meatball133

docs/RESOURCES.md

@@ -5,4 +5,5 @@
 * [Official Godot Discord](https://discord.com/invite/4JBkykG)
 * [r/godot on Reddit](https://www.reddit.com/r/godot/)
 * [Godot on Steam](https://steamcommunity.com/app/404790)
+* [Godot on itch.io](https://godotengine.itch.io/godot)
 * [Godot Forums](https://godotforums.org/)