Add Ethereal Testnet chain and icon

Author: ElvisKrop

_data/chains/eip155-657468.json

@@ -0,0 +1,18 @@
+{
+  "name": "Ethereal Testnet",
+  "title": "Ethereal Testnet",
+  "chain": "Ethereal",
+  "icon": "etherealtestnet",
+  "rpc": [],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "",
+    "symbol": "",
+    "decimals": 18
+  },
+  "infoURL": "https://www.ethereal.trade/",
+  "shortName": "ethereal-testnet",
+  "chainId": 657468,
+  "networkId": 657468,
+  "explorers": []
+}

_data/icons/etherealtestnet.json

@@ -0,0 +1,8 @@
+[
+  {
+    "url": "ipfs://bafybeiav6xd6oe4ctq6acd5wqzeoodxyoo2775fd4nudct2nankjlq2yh4",
+    "width": 363,
+    "height": 363,
+    "format": "png"
+  }
+]