update readme with usage instructions

Author: shettypuneeth

README.md

@@ -1,2 +1,28 @@
 # react-codepen-embed
-React component for embedding pens from [`Codepen.io`](https://codepen.io)
+React component for embedding pens from [`Codepen.io`](https://codepen.io)
+
+## Installation
+
+```bash
+#using npm cli
+npm install --save react-codepen-embed
+
+#using yarn
+yarn add react-codepen-embed
+```
+
+## Usage
+
+```javascript
+import React from 'react';
+import Codepen from 'react-codepen-embed';
+
+const CodepenEmbedded = () => {
+  return (
+    <Codepen
+      hash="JyxeVP"
+      user="shettypuneeth"
+    />
+  );
+}
+```