update download link of android demo.

README.md

@@ -237,6 +237,8 @@ python tools/infer.py --weights yolov6s6.pt --img 1280 1280 --webcam --webcam-ad
 *  [OpenCV Python/C++](./deploy/ONNX/OpenCV)
 *  [OpenVINO](./deploy/OpenVINO)
 *  [TensorRT](./deploy/TensorRT)
+*  [NCNN](./deploy/NCNN)
+*  [Android](./deploy/NCNN/Android)
 </details>
 
 <details open>

README_cn.md

@@ -229,6 +229,8 @@ python tools/infer.py --weights yolov6s6.pt --img 1280 1280 --webcam --webcam-ad
 *  [OpenCV Python/C++](./deploy/ONNX/OpenCV)
 *  [OpenVINO](./deploy/OpenVINO)
 *  [TensorRT](./deploy/TensorRT)
+*  [NCNN](./deploy/NCNN)
+*  [Android](./deploy/NCNN/Android)
 </details>
 
 <details open>

deploy/NCNN/Android/README.md

@@ -1,6 +1,7 @@
 # ncnn-android-yolov6
 
-The yolov6 object detection in `Android` .
+The YOLOv6 object detection demo of `Android`.
+You can directly download apk file from [Android Demo here](https://github.com/meituan/YOLOv6/releases/download/0.4.0/yolov6-android-demo.apk), many thanks to [triple Mu](https://github.com/triple-Mu).
 
 This is a sample ncnn android project, it depends on ncnn library and opencv
 
@@ -9,7 +10,7 @@ This is a sample ncnn android project, it depends on ncnn library and opencv
 - [opencv-mobile](https://github.com/nihui/opencv-mobile)
 
 
-## how to build and run
+## How to build and run
 ### step1
 
 * Download [ncnn-YYYYMMDD-android-vulkan.zip](https://github.com/Tencent/ncnn/releases) or build ncnn for android yourself