Support syscoin (#392)

* Adding support for Syscoin

* Adjusting values after review. Changed the testnet chainId to 5700.

* Updating the name of Syscoin Testnet to Syscoin Tanenbaum Testnet

* Fixing json syntax error, and removing explorers.

* Making the shortname unique by changing the testnet shortname.

Co-authored-by: bboileau <bboileau@blockchainfoundry.co>

_data/chains/eip155-57.json

@@ -0,0 +1,20 @@
+{
+  "name": "Syscoin Mainnet",
+  "chain": "SYS",
+  "network": "mainnet",
+  "rpc": [
+    "https://nevm.syscoin.org/api/eth-rpc",
+    "https://web3.syscoin.org",
+    "wss://web3.syscoin.org"
+  ],
+  "faucets": ["https://faucet.syscoin.org"],
+  "nativeCurrency": {
+    "name": "Syscoin",
+    "symbol": "SYS",
+    "decimals": 18
+  },
+  "infoURL": "https://www.syscoin.org",
+  "shortName": "sys",
+  "chainId": 57,
+  "networkId": 57
+}

_data/chains/eip155-5700.json

@@ -0,0 +1,18 @@
+{
+  "name": "Syscoin Tanenbaum Testnet",
+  "chain": "SYS",
+  "network": "testnet",
+  "rpc": [
+    "https://tanenbaum.io/api/eth-rpc"
+  ],
+  "faucets": ["https://faucet.tanenbaum.io"],
+  "nativeCurrency": {
+    "name": "Testnet Syscoin",
+    "symbol": "tSYS",
+    "decimals": 18
+  },
+  "infoURL": "https://syscoin.org",
+  "shortName": "tsys",
+  "chainId": 5700,
+  "networkId": 5700
+}