Add explanation for SalesHub.mdf

Author: Dimo Dimov

saleshub/README.md

@@ -13,3 +13,7 @@ This project demonstrates the usage of the [Kendo UI MVC extensions](http://www.
 - Custom client-side code to make Kendo UI Widgets declared with the MVC extensions interact with each other
 - Server-side filtering support for Kendo UI DataSources
 - ASP.NET MVC web services powered by Entity Framework
+
+## Database
+
+The example uses a [`SalesHub.mdf` file](https://github.com/telerik/ui-for-aspnet-mvc-examples/blob/master/saleshub/SalesHub.Client/Web.config#L12), which is [created on the fly](https://github.com/telerik/ui-for-aspnet-mvc-examples/blob/master/saleshub/SalesHub.Data/SalesHubDbInitializer.cs) in [Global.asax](https://github.com/telerik/ui-for-aspnet-mvc-examples/blob/master/saleshub/SalesHub.Client/Global.asax.cs#L29) when the project is started.