Femiworld

Hello all, I am new to this forum and this is my first Audi. I bought Q7 only last week and drove over 300 miles. All was good. today I just came home after driving 10 miles and parked the car. When I went back to restart the car, it did not start again. It only make a little noise and nothing starts. I took a video and uploaded to youtube for your reference. Here is the youtube link: https://www.youtube.com/watch?v=9tMvkHlqpXc Can somebody please help me? What to do? I am stuck.