re-organize Nextcloud project structure

Pilz.Networking.CloudProviders.Nextcloud/Client/Apps/FileRetention/FilesRetentionClient.cs

@@ -0,0 +1,45 @@
+using Pilz.Networking.CloudProviders.Nextcloud.Client.Apps.FileRetention.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pilz.Networking.CloudProviders.Nextcloud.Client.Apps.FileRetention
+{
+    public class FilesRetentionClient : ClientBase
+    {
+        public FilesRetentionClient(NextcloudClient client) : base(client)
+        {
+        }
+
+        public bool CreateRetentionRule(RetentionRuleInfo rule)
+        {
+            var entry = rule.ToOcsData();
+            return Client.Ocs.GetApi<OcsApiFilesRetention>().CreateRetentionRule(entry);
+        }
+
+        public bool DeleteRetentionRule(int ruleID)
+        {
+            return Client.Ocs.GetApi<OcsApiFilesRetention>().DeleteRetentionRule(ruleID);
+        }
+
+        public RetentionRule[]? GetRetentionRules()
+        {
+            var api = Client.Ocs.GetApi<OcsApiFilesRetention>();
+            var response = api.GetRetentionRules();
+
+            if (response?.Data is not null)
+            {
+                var rules = new List<RetentionRule>();
+
+                foreach (var entry in response.Data)
+                    rules.Add(new RetentionRule(entry));
+
+                return rules.ToArray();
+            }
+
+            return null;
+        }
+    }
+}