Arcface demo

```
 AFR_FSDKInterface engine = new AFR_FSDKEngine();

    //用来存放提取到的人脸信息, face_1 是注册的人脸，face_2 是要识别的人脸
    AFR_FSDKFace face1 = new AFR_FSDKFace();
    AFR_FSDKFace face2 = new AFR_FSDKFace();

    //初始化人脸识别引擎，使用时请替换申请的 APPID 和 SDKKEY
    AFR_FSDKError error = engine.AFR_FSDK_InitialEngine("APPID", "SDKKEY");
    Log.d("com.arcsoft", "AFR_FSDK_InitialEngine = " + error.getCode());

    //输入的 data 数据为 NV21 格式（如 Camera 里 NV21 格式的 preview 数据）；人脸坐标一般使用人脸检测返回的 Rect 传入；人脸角度请按照人脸检测引擎返回的值传入。
    error = engine.AFR_FSDK_ExtractFRFeature(data1, width, height, AFR_FSDKEngine.CP_PAF_NV21, new Rect(210, 178, 478, 446), AFR_FSDKEngine.AFR_FOC_0, face1);
    Log.d("com.arcsoft", "Face=" + face1.getFeatureData()[0]+ "," + face1.getFeatureData()[1] + "," + face1.getFeatureData()[2] + "," + error.getCode());

    error = engine.AFR_FSDK_ExtractFRFeature(data1, width, height, AFR_FSDKEngine.CP_PAF_NV21, new Rect(210, 170, 470, 440), AFR_FSDKEngine.AFR_FOC_0, face2);
    Log.d("com.arcsoft", "Face=" + face2.getFeatureData()[0]+ "," + face2.getFeatureData()[1] + "," + face2.getFeatureData()[2] + "," + error.getCode());

    //score 用于存放人脸对比的相似度值
    AFR_FSDKMatching score = new AFR_FSDKMatching(); error = engine.AFR_FSDK_FacePairMatching(face1, face2, score); Log.d("com.arcsoft", "AFR_FSDK_FacePairMatching=" + error.getCode()); Log.d("com.arcsoft", "Score:" + score.getScore());

    //销毁人脸识别引擎
    error = engine.AFR_FSDK_UninitialEngine();
    Log.d("com.arcsoft", "AFR_FSDK_UninitialEngine : " + error.getCode());
```