Include samples/tests from old f# sample pack

[dmitry-a-morozov]

F# sample pack used to have VERY IMPORTANT set of samples + tests.

Samples
http://fsharp3sample.codeplex.com/SourceControl/latest#SampleProviders/Samples.Tests/TypeProviders/TypeProviders.fs
Tests
http://fsharp3sample.codeplex.com/SourceControl/latest#SampleProviders/Samples.Tests/Clients/Clients.fs

Personally for me it test suit was live saver during type providers developments.
I think it makes sense to include it into this repository. And of course maintain it.

[dsyme]

Closing this old issue