Note to explain DI is not mandatory for .NET Core (#255)
Note to explain DI is not mandatory for .NET Core (#255)

* Note to explain DI is not mandatory for .NET Core

* Further fixes to README

* Link to NLog NuGet package

* Rearranged README for clarity

* Remove aspnet reference

NLog/NLog.Framework.Logging,NLog/NLog.Extensions.Logging,NLog/NLog.Framework.Logging