Update query-cache.md

Author: JonathanMagnan

docs2/pages/documentations/query-cache.md

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 # Query Cache
 
+> This feature is now available on [Entity Framework Classic - Query Cache](http://entityframework-classic.net/query-cache). Entity Framework Classic is a supported version from the latest EF6 code base. It supports .NET Framework and .NET Core and overcomes some EF limitations by adding tons of must-haves built-in features.
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 ## Introduction
 
 Caching entities or query results to improve an application's performance is a very frequent scenario. Major ORM like NHibernate had this feature for a long time but, unfortunately for Entity Framework users, second level caching is only available through third party libraries.