add new webcam variables to readme

README.md

@@ -216,8 +216,12 @@ Huge credit to @mnakada for his libcallback library: [https://github.com/mnakada
 
 Use as a USB Web Camera for your PC is supported.  I have tested with Windows 10 and Linux, and it appears as a Generic HD Camera.  Audio is supported.  This mode disables all other functionality, and only works as a USB Web Camera for your PC.  Experimental.  Note that the cables typically included with the camera do not data, use a known working micro-usb cable which supports data.
 
+Supported modes: MJPG 360p/720p/1080p, Video 360p/720p/1080p
+
 ```
 ENABLE_WEB_CAM="true"
+WEB_CAM_BIT_RATE="8000"
+WEB_CAM_FPS_RATE="25"
 ```
 
 ---