add users and group dto

Sources/AllInApi/DTO/GroupDTO.cs

@@ -2,5 +2,8 @@
 {
     public class GroupDTO
     {
+        public string Name { get; set; }
+        public DateTime CreationDate { get; set; }
+        public LargeImageDTO Image { get; set; }
     }
 }

Sources/AllInApi/DTO/UserDTO.cs

@@ -3,6 +3,10 @@
     public class UserDTO
     {
         public string Name { get; set; }
+        public string Mail { get; set; }
         public LargeImageDTO Image { get; set; }
+        public int NumberOfCoins { get; set; }
+
+        public List<GroupDTO> Groups { get; set;}
     }
 }