sdk: simplify getting started with single createOpencode function

Makes it easier for developers to get started by providing a single function that creates both server and client, removing the need to manually coordinate separate server and client creation

packages/sdk/js/src/index.ts

@@ -1,2 +1,20 @@
 export * from "./client.js"
 export * from "./server.js"
+
+import { createOpencodeClient } from "./client.js"
+import { createOpencodeServer, ServerOptions } from "./server.js"
+
+export async function createOpencode(options?: ServerOptions) {
+  const server = await createOpencodeServer({
+    ...options,
+  })
+
+  const client = createOpencodeClient({
+    baseUrl: server.url,
+  })
+
+  return {
+    client,
+    server,
+  }
+}