Added C++ code provider and Hello World test as sample.

--HG--
rename : Tests/CILCodeProvider.cs => Tests/CodeProviders.cs
extra : source : fd5623304a38940aa77f2e3fd2dd28ecc0129e3d
extra : amend_source : 5dfe9864db434a4b4a4728752b50efebcd5d0ad5
Merge pull request #582 from iskiselev/CppTests

Added C++ code provider and Hello World test as sample.