Update readme

README.md

@@ -4,6 +4,7 @@ The project shows how to integrate React components into GWT application. GWT ba
 
 ## Adding React component
 
+```Java
 EmbeddedReact.ReactComponentProps componentProps = new EmbeddedReact.ReactComponentProps();
 componentProps.onGoToGWTAppClicked = new MouseEventHandler() {
 	@Override
@@ -19,6 +20,7 @@ componentProps.onGoToGWTAppClicked = new MouseEventHandler() {
 };
 componentProps.currentLoggedUser = result.getUserName();
 ReactDOM.render(React.createElement(EmbeddedReact::loggedInComponent, componentProps), Document.get().getElementById("reactAppDiv"));
+```
 
 ## Build and run solution