Update README.md

Author: LogicalError

README.md

@@ -20,7 +20,9 @@ If you use this plugin, please let us know, we'd love to see what you've done wi
 
 **Unity Package Manager (UPM)**
 
-* Use the package manager to import the project using `https://github.com/LogicalError/realtime-CSG-for-unity.git`
+* Open up the package manager in Window/Package Manager
+* Press the + button in the top left corner and select Install package from Git URL
+* Import the project by entering `https://github.com/LogicalError/realtime-CSG-for-unity.git` into the text field  
 
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