added groups apis

src/Core/Models/Api/Request/GroupRequestModel.cs

@@ -0,0 +1,28 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using Bit.Core.Models.Table;
+using Newtonsoft.Json;
+
+namespace Bit.Core.Models.Api
+{
+    public class GroupRequestModel
+    {
+        [Required]
+        [StringLength(300)]
+        public string Name { get; set; }
+
+        public Group ToGroup(Guid orgId)
+        {
+            return ToGroup(new Group
+            {
+                OrganizationId = orgId
+            });
+        }
+
+        public Group ToGroup(Group existingGroup)
+        {
+            existingGroup.Name = Name;
+            return existingGroup;
+        }
+    }
+}