Update README.md

Author: emrekovanci

README.md

@@ -7,6 +7,10 @@ Unreal Engine template project(C++) for prototyping. Some plugins have been deac
 
 ### 💿 Installation
 - Put project folder in `EpicGames/UE_{Version}/Templates`.
+- Run submodule command in project folder
+```
+git submodule update --init
+```
 - Populate correct value for `UE5_DIR` in `vars.bat`.
 
 ### 🔥 Example .bat Usages