Add a --help to main.py

main.py

@@ -6,6 +6,16 @@ import threading
 import heapq
 import traceback
 
+if __name__ == "__main__":
+    if '--help' in sys.argv:
+        print("Valid Command line Arguments:")
+        print("\t--listen\t\t\tListen on 0.0.0.0 so the UI can be accessed from other computers.")
+        print("\t--port 8188\t\t\tSet the listen port.")
+        print("\t--dont-upcast-attention\t\tDisable upcasting of attention \n\t\t\t\t\tcan boost speed but increase the chances of black images.\n")
+        print("\t--use-split-cross-attention\tUse the split cross attention optimization instead of the sub-quadratic one.\n\t\t\t\t\tIgnored when xformers is used.")
+        print()
+        exit()
+
 if '--dont-upcast-attention' in sys.argv:
     print("disabling upcasting of attention")
     os.environ['ATTN_PRECISION'] = "fp16"