Add created and changed fields to playlists responses

model/playlist.go

@@ -1,13 +1,17 @@
 package model
 
+import "time"
+
 type Playlist struct {
-	ID       string
-	Name     string
-	Comment  string
-	Duration float32
-	Owner    string
-	Public   bool
-	Tracks   MediaFiles
+	ID        string
+	Name      string
+	Comment   string
+	Duration  float32
+	Owner     string
+	Public    bool
+	Tracks    MediaFiles
+	CreatedAt time.Time
+	UpdatedAt time.Time
 }
 
 type PlaylistRepository interface {