Update README.md

Author: jhan15

README.md

@@ -26,7 +26,15 @@ $ pip install -r requirements.txt
 ### Hand detector
 
 ```bash
+# Hand detector
 $ python3 hand.py --max_hands 2
+
+# Gesture detector
+$ python3 gesture.py --mode single # currenly only single-hand gestures are supported
+
+# Volume controller
+$ python3 vol_controller.py --control continuous # continuous control
+                                      step # step control
 ```
 
 ### Gesture detector