rename demo example into benchmarks

examples/benchmarks/counter.js

@@ -0,0 +1,18 @@
+export class Counter extends odoo.core.Component {
+  inlineTemplate = `
+    <div>
+      <button t-on-click="increment(-1)">-</button>
+      <span style="font-weight:bold">Value: <t t-esc="state.counter"/></span>
+      <button t-on-click="increment(1)">+</button>
+    </div>`;
+  constructor(parent, props) {
+    super(parent, props);
+    this.state = {
+      counter: props.initialState || 0
+    };
+  }
+
+  increment(delta) {
+    this.updateState({ counter: this.state.counter + delta });
+  }
+}