How can I perform this Laravel project downloaded from Github?

I am pretty new in PHP and absolutly new in Laravel (I came from Java) and I have the following doubt.

I am trying to use this implemented example from GitHub to obtain a page containing a reCaptcha:

http://ift.tt/2kTjR5Q

So I have clone this repository on my local system.

Then, as explained, I have add the "waavi/recaptcha": "1.0.x" reference into the require section of the composer.json file, that became:

"require": {
    "illuminate/support": "^5.1",
    "illuminate/config": "^5.1"
    "waavi/recaptcha": "1.0.x"
},

Ok, now what have I to do to start my application? (I think that before start I have to run composer in some way to download all the dependency of this Laravel project). What have I to do?

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