feat: add STO Chain mainnet (1306) and testnet (1999) (#8174)

Co-authored-by: ligi <[email protected]>

Author: tranduybau

_data/chains/eip155-1306.json

@@ -0,0 +1,25 @@
+{
+  "name": "STO Chain",
+  "chain": "STOC",
+  "icon": "stoc",
+  "rpc": ["https://evm-stoc-mainnet.stochainscan.io"],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "STOC",
+    "symbol": "STOC",
+    "decimals": 18
+  },
+  "features": [{ "name": "EIP155" }],
+  "infoURL": "https://www.stochain.io/",
+  "shortName": "stoc",
+  "chainId": 1306,
+  "networkId": 1306,
+  "explorers": [
+    {
+      "name": "STO Chain Explorer",
+      "url": "https://stochainscan.io/en",
+      "standard": "none"
+    }
+  ],
+  "status": "active"
+}

_data/chains/eip155-1999.json

@@ -0,0 +1,25 @@
+{
+  "name": "STO Chain Testnet",
+  "chain": "TSTOC",
+  "icon": "stoc",
+  "rpc": ["https://evm-stoc-testnet.stochainscan.io"],
+  "faucets": ["https://testnet.stochainscan.io/en/request-faucet"],
+  "nativeCurrency": {
+    "name": "TSTOC",
+    "symbol": "TSTOC",
+    "decimals": 18
+  },
+  "features": [{ "name": "EIP155" }],
+  "infoURL": "https://www.stochain.io/",
+  "shortName": "tstoc",
+  "chainId": 1999,
+  "networkId": 1999,
+  "explorers": [
+    {
+      "name": "STO Chain Testnet Explorer",
+      "url": "https://testnet.stochainscan.io/en",
+      "standard": "none"
+    }
+  ],
+  "status": "active"
+}

_data/icons/stoc.json

@@ -0,0 +1,8 @@
+[
+  {
+    "url": "ipfs://QmYtRbecDtw3z4bCdW2xeTp2XEze8sm3jhQUgxvgRijabb",
+    "width": 512,
+    "height": 512,
+    "format": "png"
+  }
+]