Added endpoint and functionality for getting, retrieving and deleting bookmarks, and for adding and removing tags for a bookmark

YABA.Models/Tag.cs

@@ -4,10 +4,9 @@ using YABA.Models.Interfaces;
 
 namespace YABA.Models
 {
-    public class Tag : IIdentifiable, ISoftDeletable
+    public class Tag : IIdentifiable
     {
         public int Id { get; set; }
-        public bool IsDeleted { get; set; }
         public string Name { get; set; }
         public bool IsHidden { get; set; }