docs: setup example section

examples/title/client.js

@@ -0,0 +1,30 @@
+const choo = require('../')
+
+const app = choo()
+app.model('title', {
+  state: { title: 'my-demo-app' },
+  reducers: {
+    'update': (action, state) => ({ title: action.payload })
+  },
+  effects: {
+    'update': (action, state, send) => (document.title = action.payload)
+  }
+})
+
+const mainView = (params, state, send) => choo.view`
+  <main class="app">
+    <h1>${state.title}</h1>
+    <label>Set the title</label>
+    <input
+      type="text"
+      placeholder=${state.title}
+      oninput=${(e) => send('title:update', { payload: e.target.value })}>
+  </main>
+`
+
+app.router((route) => [
+  route('/', mainView)
+])
+
+const tree = app.start()
+document.body.appendChild(tree)