add wagmi documentation

docs/docs/guides/wagmi_usage/_category_.yml

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+label: '🔄 Wagmi usage'
+collapsible: true
+collapsed: true
+link: null
+position: 11

docs/docs/guides/wagmi_usage/wagmi.md

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+---
+sidebar_position: 1
+sidebar_label: 'Wagmi Web3js Adaptor'
+title: 'Wagmi Web3js Adaptor'
+---
+
+If you're using [Wagmi](https://wagmi.sh/react/getting-started#use-wagmi) and want to add web3.js, use this provider in your project:
+
+
+```typescript
+import {Web3} from 'web3'
+import {useMemo} from 'react'
+import type {Chain, Client, Transport} from 'viem'
+import {type Config, useClient} from 'wagmi'
+
+export function clientToWeb3js(client?: Client<Transport, Chain>) {
+    if (!client) {
+        return new Web3()
+    }
+
+    const {transport} = client
+
+    if (transport.type === 'fallback') {
+        return new Web3(transport.transports[0].value.url)
+    }
+
+    return new Web3(transport.url)
+}
+
+/** Action to convert a viem Client to a web3.js Instance. */
+export function useWeb3js({chainId}: { chainId?: number } = {}) {
+    const client = useClient<Config>({chainId})
+    return useMemo(() => clientToWeb3js(client), [client])
+}
+
+```
+
+Usage example:
+
+```typescript
+import {useWeb3js} from '../web3/useWeb3js'
+import {mainnet} from 'wagmi/chains' // for example for mainnet
+// somewhere in your React render method
+const web3js = useWeb3js({chainId: mainnet.id})
+// ...
+```
+
+
+:::tip
+To learn about Wagmi and how to set up a Wagmi project, please follow this [link](https://wagmi.sh/react/getting-started#use-wagmi)
+:::