add source monitoring tool

source-server.py

@@ -0,0 +1,13 @@
+#!/usr/bin/python3
+import valve.source.a2s
+import argparse
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Monitor Source Server', 
+                                        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument('--host', '-H', default="127.0.0.1", help='Target Source-Server')
+    parser.add_argument('--port', '-p', type=int, default=27015, help='Target Port')
+    args = parser.parse_args()
+
+    with valve.source.a2s.ServerQuerier((args.host, args.port)) as server:
+        print(server.info()["player_count"])