begin implementing Tables API

Pilz.Networking.CloudProviders.Nextcloud/Client/Apps/Tables/Model/ColumnSelectionOption.cs

@@ -0,0 +1,18 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Client.Apps.Tables.Model
+{
+    public class ColumnSelectionOption
+    {
+        [JsonProperty("id")]
+        public long Id { get; set; }
+
+        [JsonProperty("label")]
+        public string? Label { get; set; }
+    }
+}