Update README.md

Added steps to run external camera or webcam directly.

Author: RizwanMunawar

README.md

@@ -49,6 +49,15 @@ python detect.py --weights yolov7.pt --source "your video.mp4"
 #if you want to change source file
 python detect_and_track.py --weights yolov7.pt --source "your video.mp4"
 
+#for WebCam
+python detect_and_track.py --weights yolov7.pt --source 0
+
+#for External Camera
+python detect_and_track.py --weights yolov7.pt --source 1
+
+#For LiveStream (Ip Stream URL Format i.e "rtsp://username:pass@ipaddress:portno/video/video.amp")
+python detect_and_track.py --source "your IP Camera Stream URL" --device 0
+
 #for specific class (person)
 python detect_and_track.py --weights yolov7.pt --source "your video.mp4" --classes 0