update readme

playground/app.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 const { data, error } = await useTrpcQuery('getUser', {
-  name: 'john',
+  name: 'johns',
 })
 
 watchEffect(() => {
@@ -10,5 +10,5 @@ watchEffect(() => {
 </script>
 
 <template>
-  <div>hello</div>
+  <div>{{ data.name }}</div>
 </template>

playground/server/fn/index.ts

@@ -13,4 +13,20 @@ export const router = trpc
     resolve: () => 'world',
   })
 
+// optional
+export const createContext = () => {
+  // ...
+  return {
+    /** context data */
+  }
+}
+
+// optional
+export const responseMeta = () => {
+  // ...
+  return {
+    // { headers: ... }
+  }
+}
+
 export type Router = typeof router