introduce a very simple Nextcloud API

Pilz.Networking.CloudProviders.Nextcloud/Model/UserQuota.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Model
+{
+    public class UserQuota
+    {
+        /// <summary>
+        /// Amount of free bytes left.
+        /// </summary>
+        public ulong Free { get; set; }
+
+        /// <summary>
+        /// Amount of already used bytes.
+        /// </summary>
+        public ulong Used { get; set; }
+
+        /// <summary>
+        /// Total amount of all bytes (free + used).
+        /// </summary>
+        public ulong Total { get; set; }
+
+        /// <summary>
+        /// Relative amount of used quota in percent.
+        /// </summary>
+        public float Relative { get; set; }
+
+        /// <summary>
+        /// Total amount of bytes available.
+        /// </summary>
+        public ulong Quota { get; set; }
+    }
+}