feat Juchain Testnet (#1763)

* Create chain-202599.js

* Update chain-202599.js

---------

Co-authored-by: Define101 <[email protected]>

Author: JuChain-org

constants/additionalChainRegistry/chain-202599.js

@@ -0,0 +1,29 @@
+export const data = {
+  "name": "JuChain Testnet",
+  "chain": "JU",
+  "rpc": [
+    "https://testnet-rpc.juchain.org"
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "JUcoin",
+    "symbol": "JU",
+    "decimals": 18
+  },
+  "features": [
+    { "name": "EIP155" },
+    { "name": "EIP1559" }
+  ],
+  "infoURL": "https://juchain.org",
+  "shortName": "ju",
+  "chainId": 202599,
+  "icon": "juchain",
+  "explorers": [
+    {
+      "name": "juscan-testnet",
+      "url": "https://testnet.juscan.io",
+      "icon": "juscan",
+      "standard": "EIP3091"
+    }
+  ]
+}