Implement AuthService and ApiClient core logic

Models/NetworkModels.cs

@@ -0,0 +1,16 @@
+namespace Chtn.CSharp.SDK.Models.Network
+{
+    public class CreateNetworkReq
+    {
+        public string Name { get; set; }
+        public string Visibility { get; set; }
+        public string UserId { get; set; }
+    }
+
+    public class NetworkChannel
+    {
+        public string ChannelId { get; set; }
+        public string Name { get; set; }
+        public string Desc { get; set; }
+    }
+}