Update README.md

Author: unitycoder

README.md

@@ -25,6 +25,9 @@ Old (winforms) version is here: https://github.com/unitycoder/UnityLauncher
 ## Forum Thread
 https://forum.unity.com/threads/unity-launcher-launch-correct-unity-versions-for-each-project-automatically.488718/
 
+## Instructions
+https://github.com/unitycoder/UnityLauncherPro/wiki
+
 # Screenshots
 
 ![image](https://user-images.githubusercontent.com/5438317/71485879-184b3a00-281c-11ea-97db-73c5dfa9bb4e.png)