add README

README.md

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+# Coinbase Developer Platform SDK
+
+> [!WARNING]
+> This library is under active development so things might change and break between releases.
+
+This is a TypeScript SDK for the [Coinbase Developer Platform](https://docs.cdp.coinbase.com/).
+
+## Features:
+
+- Build Onchain
+    - Node RPC [ ]
+    - Onchain Data [✔️]
+    - Paymaster [ ]
+    - Mesh [ ]
+    - Faucet
+- Payments
+    - Commerce [ ]
+    - Onramp [ ]
+- Wallets
+    - Smart Wallet [ ]
+    - Coinbase Wallet [ ]
+    - Embedded Wallet [ ]
+- Trade []
+
+## Overview
+
+```ts
+// 1. Import modules
+import { createClient, createRpcClient } from "@coinbase-platform/onchain";
+
+// 2. Create an RPC client
+const rpcClient = createRpcClient({
+  url: RPC_URL,
+  apiKey: "API_KEY",
+});
+
+// 3. Send request
+const response = await rpcClient.request({
+  method: "cdp_listBalances",
+  parameters: [
+    {
+      address: "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
+      pageSize: 1,
+    },
+  ],
+});
+
+// For convenience, you can also create a higher-level client
+const client = createClient({
+  apiKey: '<API_KEY>',
+});
+
+// Send request
+const balances = await client.listBalances([{
+  address: "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
+  pageSize: 1,
+}]);
+```
+
+## Documentation
+
+TODO
+
+## License
+
+[MIT](./LICENSE) License