return collection associations with group response

src/Core/Models/Api/Public/BaseAssociationWithPermissionsModel.cs

@@ -0,0 +1,21 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using Newtonsoft.Json;
+
+namespace Bit.Core.Models.Api.Public
+{
+    public abstract class BaseAssociationWithPermissionsModel
+    {
+        /// <summary>
+        /// The associated object's unique identifier.
+        /// </summary>
+        /// <example>bfbc8338-e329-4dc0-b0c9-317c2ebf1a09</example>
+        [Required]
+        public Guid? Id { get; set; }
+        /// <summary>
+        /// When true, the read only permission will not allow the user or group to make changes to items.
+        /// </summary>
+        [Required]
+        public bool? ReadOnly { get; set; }
+    }
+}