Add DotNetProjectFile.Analyzers

[Corniel]

DotNetProjectFile.Analyzers is a set of Roslyn analyzers that reports on issues with project files, such as MS-build project files (csproj, vbproj), and resource files (RESX). It does so by hooking into AnalysisContext.RegisterCompilationAction.

The website can be found here: https://dotnet-project-file-analyzers.github.io/

(I'm one of the contributors)