feat: introduced caching in the server + Added serilog

WotBlitzStatisticsPro.Logic/Model/CacheItem.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace WotBlitzStatisticsPro.Logic.Model
+{
+    public class CacheItem<T>
+    {
+        private const int ExpirationTimeoutInMinutes = 60;
+        private DateTime? _lastRefreshed = null;
+
+        private T? _itemData = default(T);
+
+        public long AccountId { get; set; }
+
+        public bool IsExpired => _lastRefreshed != null &&
+                                 (DateTime.Now - _lastRefreshed.Value).TotalMinutes > ExpirationTimeoutInMinutes;
+
+        public T? Data
+        {
+            get => _itemData;
+            set
+            {
+                _itemData = value;
+                _lastRefreshed = DateTime.Now;
+
+            }
+        }
+    }
+}