add description and examples

app.py

@@ -187,4 +187,4 @@ with torch.no_grad():
         for opt.weights in ['yolov7.pt']:
             strip_optimizer(opt.weights)
    
-gr.Interface(detect,gr.Image(type="pil"), gr.Image(type="pil"),title="Yolov7").launch()
+gr.Interface(detect,gr.Image(type="pil"), gr.Image(type="pil"),title="Yolov7",examples=[["horses.jpeg"]],description="demo for WongKinYiu/yolov7 Trainable bag-of-freebies sets new state-of-the-art for real-time object detectors").launch()