added README.md

Author: mrbindraw

Example.png

@@ -0,0 +1,19 @@
+# CheckAppInstance
+Plugin for UE4 project.  
+This plugin make possible only one instance of your game can be run at the same time. 
+This plugin created mostly who don't like C++.)
+
+# Install
+1. Unzip CheckAppInstance-build-win64-X.X.X-ueX.XX.X.zip into ROOT_UE4\Engine\Plugins
+2. Make Blueprint class BP_GameInstance derived from GameInstance.
+3. Call on EventInit method CheckAnotherAppInstance.
+4. ProjectSettings -> Maps&Modes -> Game Instance Class: BP_GameInstance
+
+**C++/Blueprints functions:**
+- CheckAnotherAppInstance(bool IsEnabled = true)
+
+<img src="Example.png"/>
+
+
+
+