chore: provide shell to download models

.gitignore

@@ -1,3 +1,4 @@
 test_data*
 __debug_bin*
-.vscode
+.vscode
+models/

download_models.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -e
+
+SAVEDIR="./models"
+
+if [ "$#" != "0" ]; then 
+    SAVEDIR="$1"
+fi 
+
+echo "downloading model files to dir:$SAVEDIR..."
+
+if [ -d "$SAVEDIR" ]; then
+    echo "DIR: $SAVEDIR exist, remove it first!"
+    exit 0
+fi 
+
+mkdir "$SAVEDIR" -p 
+curl https://github.com/Kagami/go-face-testdata/raw/master/models/shape_predictor_5_face_landmarks.dat -L -o "$SAVEDIR/shape_predictor_5_face_landmarks.dat"
+curl https://github.com/Kagami/go-face-testdata/raw/master/models/dlib_face_recognition_resnet_model_v1.dat -L -o "$SAVEDIR/dlib_face_recognition_resnet_model_v1.dat"
+curl https://github.com/Kagami/go-face-testdata/raw/master/models/mmod_human_face_detector.dat -L -o "$SAVEDIR/mmod_human_face_detector.dat"
+
+echo "model file download succ"