adding tBTC token (#4599)

* adding asset Keep Network TBTC token and logo

* adding in an info.json file for tBTC

blockchains/ethereum/assets/0x8dAEBADE922dF735c38C80C7eBD708Af50815fAa/info.json

@@ -0,0 +1,20 @@
+{
+  "name": "tBTC",
+  "website": "https://tbtc.network/",
+  "source_code": "https://github.com/keep-network/tbtc",
+  "short_description": "Trustlessly tokenized Bitcoin on Ethereum.",
+  "description": "tBTC is a trustlessly Bitcoin-backed ERC-20 token.",
+  "socials": [
+    {
+      "name": "Twitter",
+      "url": "https://twitter.com/tBTC_project",
+      "handle": "tBTC_project"
+    },
+    {
+      "name": "Reddit",
+      "url": "https://reddit.com/r/KeepNetwork",
+      "handle": "KeepNetwork"
+    }
+  ],
+  "explorer": "https://etherscan.io/token/0x8dAEBADE922dF735c38C80C7eBD708Af50815fAa"
+}