Add initial description

Author: webbertakken

README.md

@@ -1,2 +1,6 @@
-# unity-request-manual-activation-file-action
-Unity - Request manual activation file
+# Request Manual Activation File
+Github Action for requesting Unity's manual activation file. 
+
+Required to acquire a license, used in the **Activate**, **Test** and **Build** actions
+
+This action is part of the [Unity Actions](https://github.com/webbertakken/unity-actions) collection