Implemented ability to have server settings. Currently cache directory is there but it is not configurable (or used in this commit)

API/DTOs/ServerSettingDTO.cs

@@ -0,0 +1,9 @@
+namespace API.DTOs
+{
+    public class ServerSettingDto
+    {
+        public string CacheDirectory { get; set; }
+        // public string Kind { get; init; }
+        // public string Value { get; init; }
+    }
+}