Added shouldly to dotnet-developer-projects.md

Author: JakeGinnivan

dotnet-developer-projects.md

@@ -205,6 +205,7 @@ Please sort projects alphabetically and provide a one-line description. GitHub/C
  * [moq](https://github.com/Moq/moq4) - The most popular and friendly mocking framework for .NET
  * [NSubstitute](https://github.com/nsubstitute/NSubstitute) - A friendly substitute for .NET mocking frameworks.
  * [NUnit](https://github.com/nunit/nunit) - NUnit is a unit-testing framework for all .NET languages.
+ * [Shouldly](https://github.com/shouldly/shouldly) - Should style test assertion library with great error messages.
  * [tickspec](http://tickspec.codeplex.com/) - A lightweight Behaviour Driven Development (BDD) framework.
  * [TestStack.BDDfy](https://github.com/TestStack/TestStack.BDDfy) - BDDfy is the simplest BDD framework to use, customize and extend!
  * [TestStack.FluentMvcTesting](https://github.com/TestStack/TestStack.FluentMVCTesting) - Simple, terse, fluent unit testing for ASP.NET MVC Controllers.