chore: add prompt to install obs-websocket

README.md

@@ -4,7 +4,8 @@ Currently this is a proof-of-concept plugin to show some practical usage of [mid
 
 ## Usage
 
-1. [Download the plugin](https://github.com/midi-mixer/plugin-obs/archive/main.zip)
-2. Extract the `plugin-obs-main` folder to `%appdata%/midi-mixer-app/plugins`
+1. Download and install [obs-websocket](https://obsproject.com/forum/resources/obs-websocket-remote-control-obs-studio-from-websockets.466/) for OBS
+2. [Download the plugin](https://github.com/midi-mixer/plugin-obs/archive/main.zip)
+3. Extract the `plugin-obs-main` folder to `%appdata%/midi-mixer-app/plugins`
 
 For more information on how this plugin was made (or to make your own) check out [midi-mixer-plugin](https://github.com/midi-mixer/midi-mixer-plugin) and the [midi-mixer/plugin-template](https://github.com/midi-mixer/plugin-template) repository.