如何在laravel 5.2中添加新路线

I am new to laravel,

this is my issue, I downloaded latest laravel 5.2 using composer and run initial code using wamp, it runs without any issue. Now I want to add a simple about us page. So I put href in welcome.blade.php

<a href="{{ url('aboutus') }}">About Us</a>

After that I changed the route.php as below:

Route::get ( '/', function () {
return view ( 'welcome' );
} );

Route::get ( '/aboutus', function () {
    return view ( 'welcome' );
} );


Route::group ( [ 
        'middleware' => [ 
                'web' 
        ] 
], function () {

} );

I just added the "aboutus" route part, but when I click the About Us link, server gives a 404 error, please help me.

Use Route::get ( 'aboutus', function () {
    return view ( 'welcome' );
} );

Please check this.