Why my localhost page started with MAMP isn't working [closed]

I installed MAMP, started apache from the folder that contains index.php, link below with the site files, can't get it working... i don't know how to start it

https://github.com/Robikkk/mamp

Server starts and everything but, when i go to localhost:8888/MAMP/ i get this message

This page isn't working at the moment localhost sent an invalid response. ERR_INVALID_HTTP_RESPONSE

Sorry but it's the first time i'm doing this stuff