Update ncnn-android-scrfd link and demo screenshot (#2925)

* Update ncnn-android-scrfd link and demo picture

* Update ncnn-android-scrfd link and demo screenshot

README.md

@@ -165,12 +165,11 @@ ncnn 是一个为手机端极致优化的高性能神经网络前向计算框架
 * https://github.com/nihui/ncnn-android-mobilenetssd
 * https://github.com/moli232777144/mtcnn_ncnn
 * https://github.com/nihui/ncnn-android-yolov5
+* https://github.com/nihui/ncnn-android-scrfd 🤩
 
-![](https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-2.jpg)
-![](https://github.com/nihui/ncnn-assets/raw/master/20181217/4.jpg)
-![](https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-33.jpg)
-![](https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-m.png)
-![](https://github.com/nihui/ncnn-android-yolov5/raw/master/screenshot.jpg)
+<img src="https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-2.jpg" width="360" height="640"/> <img src="https://github.com/nihui/ncnn-assets/raw/master/20181217/4.jpg" width="360" height="640"/>
+<img src="https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-33.jpg" width="360" height="640"/> <img src="https://github.com/nihui/ncnn-assets/raw/master/20181217/ncnn-m.png" width="360" height="640"/>
+<img src="https://github.com/nihui/ncnn-android-yolov5/raw/master/screenshot.jpg" width="360" height="800"/> <img src="https://github.com/nihui/ncnn-android-scrfd/raw/master/screenshot.jpg" width="360" height="800"/>
 
 
 ---