Added readme.

README.md

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+# Switcheroo Example Project
+A simple example project for [Switcheroo](https://minifloppy.it/tools/switcheroo/), that demo how to use the plugin to dynamically update the UI depending on which input device the player is using.
+
+![Switcheroo example](https://www.dropbox.com/s/7avtk7st24hcirn/switcheroo-live.gif?raw=1)
+
+## About Switcheroo
+[Switcheroo](https://minifloppy.it/tools/switcheroo/) is a plugin for Unreal Engine that makes it easy to detect whether the player is using a gamepad or the keyboard/mouse combo, and react accordingly. It can be [purchased on the Unreal Engine Marketplace](https://www.unrealengine.com/marketplace/switcheroo).
+
+Feel free to [join the Discord](https://discord.gg/SnTjyhHEny) or [get in touch](https://minifloppy.it/contact/) if you have any questions.