Adding a simple example of using MultiSelect

Author: BrianGenisio

README.md

@@ -8,9 +8,38 @@ React Multi Select Component
 
 ## Installation:
 `npm install --save @khanacademy/react-multi-select`
+`yarn add @khanacademy/react-multi-select`
 
 ## Usage:
-See the examples in ``/src/stories/index.js` for how to use the component
+See the examples in `/src/stories/index.js` for how to use the component, but here is a minimum required setups:
+
+```
+import React from 'react';
+import MultiSelect from "@khanacademy/react-multi-select";
+
+const options = [
+  {label: "One", value: 1},
+  {label: "Two", value: 2},
+  {label: "Three", value: 3},
+];
+
+class Consumer extends React.Component {
+  state = {
+    selected: [],
+  }
+
+  render() {
+    const {selected} = this.state;
+
+    return <MultiSelect
+      options={options}
+      selected={selected}
+      onSelectedChanged={selected => this.setState({selected})}
+    />
+  }
+}
+```
+
 
 ## i18n:
 You can override the strings to be whatever you want, including translations for your languages.