Update README.md

Author: maxfleetdev

README.md

@@ -1 +1,10 @@
-Command Tool for Unity 2019+
+# Command Tool for Unity 2019+
+
+## Installation
+### Option A:
+1) Copy this repo's .git URL
+2) Open Unity Package Manager
+3) Click '+' icon and select 'Install from git URL'
+4) Paste URL
+5) Hit Enter/Click done
+6) Package will install