Add example

example_test.go

@@ -0,0 +1,33 @@
+package face
+
+import (
+	"fmt"
+	"log"
+)
+
+const (
+	// Path to directory with models.
+	modelDir = "testdata"
+
+	// Test image with 10 faces.
+	testImageTenFaces = "testdata/pristin.jpg"
+)
+
+// This example shows the basic usage of the package: create an
+// recognizer, recognize faces, classify them using few known ones.
+func Example() {
+	rec, err := NewRecognizer(modelDir)
+	if err != nil {
+		log.Fatalf("Can't init face recognizer: %v", err)
+	}
+
+	faces, err := rec.RecognizeFile(testImageTenFaces)
+	if err != nil {
+		log.Fatalf("Can't get faces: %v", err)
+	}
+	numFaces := len(faces)
+	if numFaces != 10 {
+		log.Fatalf("Wrong number of faces: %d", numFaces)
+	}
+	fmt.Printf("Faces on %s: %v", testImageTenFaces, faces)
+}