Merge pull request #33 from say25/master

Add NuGet Build Badge

Author: TylerCarlson1

README.md

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 `Automapper.Collection.EntityFrameworkCore` will help you mapping of EntityFrameowrk Core DbContext-object.
 
+[![NuGet](http://img.shields.io/nuget/v/Automapper.Collection.EntityFrameworkCore.svg)](https://www.nuget.org/packages/Automapper.Collection.EntityFrameworkCore/)
+
 ## Configuration examples
 
 - Usage together with Dependency injection and AutoMapper.Extensions.Microsoft.DependencyInjection pacakge