Implement AuthService and ApiClient core logic

Models/PictureModels.cs

@@ -0,0 +1,21 @@
+using Chtn.CSharp.SDK.Models.Common;
+using Newtonsoft.Json;
+using System.Collections.Generic;
+
+namespace Chtn.CSharp.SDK.Models.Media
+{
+    public class Album
+    {
+        [JsonProperty("albumId")] public string ImageId { get; set; }
+        [JsonProperty("name")] public string Name { get; set; }
+        [JsonProperty("images")] public List<Image> Images { get; set; }
+    }
+    public class Image
+    {
+        [JsonProperty("imageId")] public string ImageId { get; set; }
+        [JsonProperty("path")] public string Path { get; set; }
+        [JsonProperty("title")] public string Title { get; set; }
+        [JsonProperty("uploaded_at")] public TimeStamp UploadedAt { get; set; }
+
+    }
+}