return attachments from API

src/Core/Models/Data/CipherAttachment.cs

@@ -0,0 +1,36 @@
+using Newtonsoft.Json;
+using System;
+
+namespace Bit.Core.Models.Data
+{
+    public class CipherAttachment
+    {
+        public Guid Id { get; set; }
+        public Guid? UserId { get; set; }
+        public Guid? OrganizationId { get; set; }
+        public string AttachmentId { get; set; }
+        public string AttachmentData { get; set; }
+
+        public class MetaData
+        {
+            private long _size;
+
+            [JsonIgnore]
+            public long Size
+            {
+                get { return _size; }
+                set { _size = value; }
+            }
+
+            // We serialize Size as a string since JSON (or Javascript) doesn't support full precision for long numbers
+            [JsonProperty("Size")]
+            public string SizeString
+            {
+                get { return _size.ToString(); }
+                set { _size = Convert.ToInt64(value); }
+            }
+
+            public string FileName { get; set; }
+        }
+    }
+}