add Widevine to the readme

README.md

@@ -71,6 +71,14 @@ Then restart waydroid service with command below :
 
     sudo systemctl start waydroid-container.service
     
+## Integrate Widevine DRM (L3)
+
+    sudo python3 waydroid_extras.py -w
+Then restart waydroid service with command below :
+
+    sudo systemctl start waydroid-container.service
+ 
+
 ## Get Android ID for device registration
 
 You need to register you device with its it before being able to use gapps, this will print out your Android ID which you can use for device registration required for google apps: