You can read the documentation in Documentation folder in project.
After downloading file just extract in your computer and :
Step 1 : Extract .zip and upload files to your server.
Step 2 : Open index.php and if($username == "A" && $password == "B")
change this things to login. Replace them with your new username and password. You will login on manager with them.
Step 3 : Open yourdomain.com/slidergallerymanager to add your slider or gallery.