Add installation and simple example

Author: stevensacks

README.md

@@ -6,7 +6,34 @@ ReactSmartScroll is a lightweight, high-performance, easy-to-use way to render l
 
 ReactSmartScroll is un-opinionated, with minimum configuration. It has automatic support for variable height rows, even if they change height at runtime due to resizing, expanding, etc.
 
-Working Demo with variable height rows:
+### Installation
+```
+yarn add react-smart-scroll
+
+npm install --save react-smart-scroll
+```
+
+### Super Simple Sample:
+```javascript
+import ReactSmartScroll from 'react-smart-scroll';
+
+const data = [
+    {id: 1, text: 'Hello'},
+    {id: 2, text: 'World'},
+];
+
+const TestRow = ({data, rowRef}) => (
+    <div ref={rowRef}>
+        {data.text}
+    </div>
+);
+
+export default () => (
+    <ReactSmartScroll data={data} row={TestRow} />
+);
+```
+
+### Working Demo with variable height rows:
 https://codesandbox.io/s/react-smart-scroll-demo-3x1ym
 
 **This component uses React Hooks, so it requires React 16.8.x or above.**