chore: Add deprecation notice

Add a deprecation notice, and an example of how to build a basic
provider using the newer packages we have replaced this with.

README.md

@@ -2,7 +2,34 @@
 
 Web3 ProviderEngine is a tool for composing your own [web3 providers](https://github.com/ethereum/wiki/wiki/JavaScript-API#web3).
 
-<table><tr><td><p align="center"><b>⚠️ PLEASE READ ⚠️</b></p><div align="center">This package was originally created for MetaMask and is being phased out in favor of <a href="https://www.npmjs.com/package/@metamask/json-rpc-engine"><code>@metamask/json-rpc-engine</code></a> and <a href="https://www.npmjs.com/package/@metamask/eth-json-rpc-middleware"><code>@metamask/eth-json-rpc-middleware</code></a>. As such, we will no longer be accepting changes to this package except those which address security issues.</div></td></tr></table>
+> [!CAUTION]
+> This package has been deprecated.
+>
+> This package was originally created for MetaMask, but has been replaced by `@metamask/json-rpc-engine`, `@metamask/eth-json-rpc-middleware`, and `@metamask/eth-json-rpc-provider`.
+>
+>Here is an example of how to create a provider using those packages:
+>
+> ```typescript
+>import { providerFromMiddleware } from '@metamask/eth-json-rpc-provider';
+>import { createFetchMiddleware } from '@metamask/eth-json-rpc-middleware';
+>
+>const rpcUrl = '[insert RPC URL here]';
+>
+>const fetchMiddleware = createFetchMiddleware({ rpcUrl });
+>const provider = providerFromMiddleware(fetchMiddleware);
+>
+>provider.sendAsync(
+>  { id: 1, jsonrpc: '2.0', method: 'eth_chainId' },
+>  (error, response) => {
+>    if (error) {
+>      console.error(error);
+>    } else {
+>      console.log(response.result);
+>    }
+>  }
+>);
+>```
+
 
 ### Composable