add lit chain button and more chain info

Author: glitch003

docs/governance/litkey/lit-chain.mdx

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+import AddLitChainButton from "@site/src/components/AddLitChainButton";
+
+---
+title: "Lit Chain"
+---
+
+
+Lit Chain is an Arbitrum Orbit-based L3 rollup that acts as the shared state layer for Lit Protocol.  
+
+## Connecting to Lit Chain
+
+To connect to Lit Chain, you can click <AddLitChainButton /> or manually add the network parameters below.  For production use cases, you should get a free private RPC URL from Conduit by clicking "Get an API Key" on the [Lit Chain hub page](https://hub.conduit.xyz/lit-chain-1rw3jdu82h).
+
+:::note
+The below and additional chain facts are available [here](https://hub.conduit.xyz/lit-chain-1rw3jdu82h).
+:::
+
+| Parameter Name     | Value                                              |
+|--------------------|----------------------------------------------------|
+| Chain ID           | 175200                                             |
+| Name               | Lit Chain                                          |
+| RPC URL            | https://lit-chain-rpc.litprotocol.com              |
+| Block Explorer URL | https://lit-chain-explorer.litprotocol.com         |
+| Currency Symbol    | LITKEY                                             |
+| Currency Decimals  | 18                                                 |

docs/snippets/AddLitChainButton.jsx

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+import React from 'react';
+
+export default function AddLitChainButton() {
+  const addNetwork = () => {
+    const params = [
+      {
+        chainId: '0x2AC60',
+        chainName: 'Lit Chain',
+        nativeCurrency: {
+          name: 'Lit Protocol',
+          symbol: 'LITKEY',
+          decimals: 18,
+        },
+        rpcUrls: ['https://lit-chain-rpc.litprotocol.com'],
+        blockExplorerUrls: [
+          'https://lit-chain-explorer.litprotocol.com',
+        ],
+      },
+    ];
+
+    window.ethereum
+      .request({ method: 'wallet_addEthereumChain', params })
+      .then(() => console.log('Success'))
+      .catch(error => console.log('Error', error.message));
+  };
+
+  return (
+    <button onClick={addNetwork}>Add Lit Chain to Metamask</button>
+  );
+}