Update README with installation, testing, and license information

Author: remarkablemark

README.md

@@ -1 +1,26 @@
 # html-react-parser
+
+An HTML to React parser.
+
+```js
+var Parser = require('html-react-parser');
+var reactElement = Parser('<p>Hello, world!</p>');
+
+// ReactDOM.render(reactElement, node);
+```
+
+## Installation
+
+```sh
+$ npm install html-react-parser
+```
+
+## Testing
+
+```sh
+$ npm test
+```
+
+## License
+
+[MIT](https://github.com/remarkablemark/html-react-parser/blob/master/LICENSE)