Update delegates.json (#599)

Add Polkagate

Co-authored-by: Julien <jeluard@users.noreply.github.com>

assets/data/polkadot/delegates.json

@@ -143,5 +143,10 @@
     "name": "Amforc",
     "address": "1eGtATyy4ayn77dsrhdW8N3Vs1yjqjzJcintksNmScqy31j",
     "manifesto": "We are strong believers of a free market focusing on protection of privacy, political freedom, and economic freedom for the long term growth of the network.\n\n## About us\nAmforc is a bootstrapped company based in Switzerland, and is exclusively committed to the Polkadot ecosystem. We run a hybrid-cloud setup in combination with our own data center (colocation) in a former military bunker. Our expertise covers the areas of IT infrastructure and security, legal and regulatory matters, as well as tokenomics and game theory.\n\n## Contact\n[Twitter](twitter.com/amforcag) \n [Email](mailto:contact@amforc.com)"
+  },
+  {
+    "name": "PolkaGate",
+    "address": "17VdcY2F3WvhSLFHBGZreubzQNQ3NZzLbQsugGzHmzzprSG",
+    "manifesto": "Your wallet for the Polkadot ecosystem. Take an active role in shaping the future of Polkadot by delegating your votes to us. Join today and contribute to a decentralized future."
   }
 ]