Add instructions to readme

Author: rafgraph

README.md

@@ -1 +1,22 @@
 # React Router Hash Link
+
+***Note that this is for React Router v4, for v2/3 see [this solution](https://github.com/rafrex/react-router-hash-link/tree/react-router-v2/3).***
+
+[Live Example](http://react-router-hash-link.rafrex.com/)
+
+This is a solution to React Router's issue of not scrolling to `#hash-fragments` when using the `<Link>` component to navigate.
+
+When you click on a link created with `react-router-hash-link` is will scroll to the element on the page with with the `id` that matches the `#hash-fragment` in the link. Note that you must use React Router's `BrowserRouter` for this to work.
+
+```shell
+$ npm install --save react-router-hash-link
+```
+
+```javascript
+// In YourComponent.js
+...
+import { HashLink as Link } from 'react-router-hash-link';
+...
+// Use it just like a RRv4 link:
+<Link to="/some/path#with-hash-fragment">Link to Hash Fragment<Link>
+```