Doc: update README.md

Add tip for python path

Author: LinjingZhang

README.md

@@ -60,6 +60,8 @@ If you are downloading J-Link for the first time, make sure to check this box: I
 
 XMC-for-Arduino requires Python 3.x and `pyserial`. Make sure Python is installed on your machine and available in the system path.
 
+:bulb: Tips for Windows users: While installing python, make sure to check the box that says "Add Python to PATH" before clicking on the install button. This option will automatically set the PATH for you. f you forgot to check the box during installation, you can add Python to PATH manually. 
+
 You can check if it was successfully installed by opening your command line or terminal and typing:
 ```
   python --version