Create CMake files for Tests and DebugBot directories

[Cryptyc]

From @alkurbatov :
I still suggest to apply this:
tests/CMakeLists.txt #include all the nested tests directories (unit-tests, debug bot, functional tests).
tests/DebugBot/CMakeLists.txt # Compile the debug bot.

There is not much work to do and we could add unitests someday, don't want to restructure the project again.

[lladdy]

@alkurbatov if you know any projects that are setup like this, it would be good to have them as reference.

[alkurbatov]

https://github.com/Microsoft/cpprestsdk/tree/master/Release/tests

[lladdy]

I believe now this issue has been satisfied and can be closed.