Introduce telemetry endpoint

polkadot/service/res/polkadot.json

@@ -12,7 +12,12 @@
     "/dns4/cc1-0.parity.tech/tcp/30333/p2p/12D3KooWSz8r2WyCdsfWHgPyvD8GKQdJ1UAiRmrcrs8sQB3fe2KU",
     "/dns4/cc1-1.parity.tech/tcp/30333/p2p/12D3KooWFN2mhgpkJsDBuNuE5427AcDrsib8EoqGMZmkxWwx3Md4"
   ],
-  "telemetryEndpoints": [],
+  "telemetryEndpoints": [
+    [
+      "wss://telemetry.polkadot.io/submit/",
+      0
+    ]
+  ],
   "protocolId": "dot",
   "properties": {
     "ss58Format": 0,
@@ -11674,4 +11679,4 @@
       "childrenDefault": {}
     }
   }
-}
\ No newline at end of file
+}