added new in memory cache.

NzbDrone.Common/Cache/CacheManger.cs

@@ -0,0 +1,22 @@
+using System;
+using NzbDrone.Common.EnsureThat;
+
+namespace NzbDrone.Common.Cache
+{
+    public static class CacheManger
+    {
+        private static readonly ICached<object> Cache;
+
+        static CacheManger()
+        {
+            Cache = new Cached<object>();
+        }
+
+        public static ICached<T> GetCache<T>(Type type)
+        {
+            Ensure.That(() => type).IsNotNull();
+
+            return (ICached<T>)Cache.Get(type.FullName, () => new Cached<T>());
+        }
+    }
+}