update readme

Author: Faramaz Pat

README.md

@@ -1,3 +1,22 @@
-Simple router react to keep the scroll of the page and to restore it if the user clicks on the back button of its browser
+### Simple react component to keep the scroll of the page and to restore it if the user clicks on the back button of its browser
+
+I did this package because I was frustrated that the new react router (4) does not restore the scroll when I click on the back button of my browser.
+
+only work with react and react router v4
+
+#### import component in your main page
+
+```javascript
+import ScrollMemory from 'react-router-scroll-memory';
+```
+
+#### add the component after the Router
+
+```jsx
+  <BrowserRouter>
+    <ScrollMemory />
+    <App />
+  </BrowserRouter>
+```
+
 
-for use with react router v4