Adding nym mainnet configuration

- added json file
- added nym logo

src/chains/mainnet/nym.json

@@ -0,0 +1,24 @@
+{
+    "chain_name": "nyx",
+    "api": ["https://api.nyx.nodes.guru"],
+    "rpc": ["https://rpc.nyx.nodes.guru"],
+    "snapshot_provider": "",
+    "sdk_version": "0.45.1",
+    "coin_type": "118",
+    "min_tx_fee": "8000",
+    "assets": [{
+        "base": "unym",
+        "symbol": "NYM",
+        "exponent": "6",
+        "coingecko_id": "nym",
+        "logo": "/logos/nym.jpeg"
+    },{
+        "base": "unyx",
+        "symbol": "NYX",
+        "exponent": "6",
+        "coingecko_id": "",
+        "logo": "/logos/nym.jpeg"
+    }],
+    "addr_prefix": "n",
+    "logo": "/logos/nym.jpeg"
+}