cakePHP 3.0 "out of the box" working example for the novice user ???

I am a cakePHP novice and am attempting to learn by examination of a working model.
So far I have downloaded two cakePHP 3 examples. Both were missing a \vendor\autoload.php component.
Can anyone point me to a cakePHP 3 example that works "out of the box" without any
additional setup required for the novice user ?

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