Excel report should identify which recipes include cake-version.yml

[Jericho]

As a result of a recent discussion between @gep13, @pascalberger and myself, we will add a new "best practice" rule for recipes: they should include a file called cake-version.yml which should include the version of Cake they target and the .NET framework(s) they are compatible with.

The "Recipes" worksheet in the Excel report generated by Addin Discoverer should have a new column to indicate if the file is present and contains the expected data.

[pascalberger]

The cake-version.yml file will only be available for recipes for Cake scripting. For recipes targeting Cake Frosting you can read version from the csproj

[Jericho]