Add Input Helper addon (#249)

Co-authored-by: Hugo Locurcio <[email protected]>

README.md

@@ -186,6 +186,7 @@ See [Vivraan/godot-lang-support](https://github.com/Vivraan/godot-lang-support).
 - [GUT](https://github.com/bitwes/Gut) - Utility for writing unit tests in GDScript (Godot 3.x).
 - [HTerrain](https://github.com/Zylann/godot_heightmap_plugin) - Heightmap-based terrain. Supports texture painting, colouring, holes, level of detail and grass (Godot 3.x).
 - [InGrid](https://github.com/Larpon/ingrid) - Infinite scrolling grid (Godot 3.x).
+- [Input Helper](https://github.com/nathanhoad/godot_input_helper) - A helper for detecting input devices and remapping controls (Godot 3.x).
 - [obs-websocket-gd](https://github.com/you-win/obs-websocket-gd) - Script and editor plugin to control Open Broadcaster Software from Godot via obs-websocket (Godot 3.x).
 - [Ridiculous Coding](https://github.com/jotson/ridiculous_coding) - Makes your coding experience in Godot 1000× more ridiculous (Godot 3.x).
 - [Scrolling Background](https://github.com/dploeger/godot-scrollingbackground) - A scrolling background node (Godot 2.1,3.x).