fix readme

Author: limuy2022

README.md

@@ -8,6 +8,6 @@ Godot 4.2.2
 
 Because of the godot extensions of Rust and Cpp,you should make sure that the rust and cpp compiler have been installed.
 
-Then you can run ```python script/build.py``` to build the extension (both Debug and Release)
+Then you can run ```cd script && python build.py``` to build the extension (both Debug and Release)
 
 Finally,you can start godot editor and develop or export the game.