Add Shardeum chain (#1319)

* Add Shardeum mainnet chain configuration

* update shardeum image location

* update rpc and rest dns

Author: urnotsam

cosmos/shardeum_8118.json

@@ -0,0 +1,49 @@
+{
+  "chainId": "shardeum_8118-1",
+  "chainName": "Shardeum",
+  "chainSymbolImageUrl": "https://raw.githubusercontent.com/chainapsis/keplr-chain-registry/main/images/shardeum_8118/chain.png",
+  "rpc": "https://rpc.shardeum.org",
+  "rest": "https://rest.shardeum.org",
+  "nodeProvider": {
+    "name": "Shardeum",
+    "email": "[email protected]",
+    "website": "https://shardeum.org"
+  },
+  "bip44": {
+    "coinType": 60
+  },
+  "bech32Config": {
+    "bech32PrefixAccAddr": "shardeum",
+    "bech32PrefixAccPub": "shardeumpub",
+    "bech32PrefixValAddr": "shardeumvaloper",
+    "bech32PrefixValPub": "shardeumvaloperpub",
+    "bech32PrefixConsAddr": "shardeumvalcons",
+    "bech32PrefixConsPub": "shardeumvalconspub"
+  },
+  "currencies": [
+    {
+      "coinDenom": "SHM",
+      "coinMinimalDenom": "ashm",
+      "coinDecimals": 18,
+      "coinGeckoId": "shardeum"
+    }
+  ],
+  "feeCurrencies": [
+    {
+      "coinDenom": "SHM",
+      "coinMinimalDenom": "ashm",
+      "coinDecimals": 18,
+      "gasPriceStep": {
+        "low": 2240000000000000,
+        "average": 2440000000000000,
+        "high": 2640000000000000
+      }
+    }
+  ],
+  "stakeCurrency": {
+    "coinDenom": "SHM",
+    "coinMinimalDenom": "ashm",
+    "coinDecimals": 18
+  },
+  "features": ["eth-address-gen", "eth-key-sign"]
+}