[Langs] Add a Nitra.DotNet.Languages.sln for languages development (Cx# & Nemerle 2).
[Langs] Add a Nitra.DotNet.Languages.sln for languages development (Cx# & Nemerle 2).

rsdn/nitra,rsdn/nitra,JetBrains/Nitra,JetBrains/Nitra