Add eCredits mainnet & testnet (#826)

* Added eCredits mainnet & testnet

* Fix file naming of chain files to .json

* Unique short name for testnet.

* testnet: ecs-testnet

Co-authored-by: Siegfried Skalla <s.skalla@cryptix.ag>

_data/chains/eip155-63000.json

@@ -0,0 +1,23 @@
+{
+  "name": "eCredits Mainnet",
+  "chain": "ECS",
+  "network": "mainnet",
+  "rpc": [
+    "https://rpc.ecredits.com"
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "eCredits",
+    "symbol": "ECS",
+    "decimals": 18
+  },
+  "infoURL": "https://ecredits.com",
+  "shortName": "ecs",
+  "chainId": 63000,
+  "networkId": 63000,
+  "explorers": [{
+    "name": "eCredits MainNet Explorer",
+    "url": "https://explorer.ecredits.com",
+    "standard": "EIP3091"
+  }]
+}

_data/chains/eip155-63001.json

@@ -0,0 +1,25 @@
+{
+  "name": "eCredits Testnet",
+  "chain": "ECS",
+  "network": "testnet",
+  "rpc": [
+    "https://rpc.tst.ecredits.com"
+  ],
+  "faucets": [
+    "https://faucet.tst.ecredits.com"
+  ],
+  "nativeCurrency": {
+    "name": "eCredits",
+    "symbol": "ECS",
+    "decimals": 18
+  },
+  "infoURL": "https://ecredits.com",
+  "shortName": "ecs-testnet",
+  "chainId": 63001,
+  "networkId": 63001,
+  "explorers": [{
+    "name": "eCredits TestNet Explorer",
+    "url": "https://explorer.tst.ecredits.com",
+    "standard": "EIP3091"
+  }]
+}