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

API/Entities/ServerSetting.cs

@@ -0,0 +1,20 @@
+using System.ComponentModel.DataAnnotations;
+using API.Entities.Interfaces;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Entities
+{
+    public class ServerSetting : IHasConcurrencyToken
+    {
+        [Key]
+        public string Key { get; set; }
+        public string Value { get; set; }
+
+        [ConcurrencyCheck]
+        public uint RowVersion { get; set; }
+        public void OnSavingChanges()
+        {
+            RowVersion++;
+        }
+    }
+}