Adding generating of a doxygen documentation usinf the CMake tool.
Add a new target named 'doc'.

	modified:   CMakeLists.txt
	new file:   doc/CMakeLists.txt
	new file:   doc/doxygen.config.in
Removing useless unit tests.

	modified:   CMakeLists.txt
Add unit tests.

	modified:   CMakeLists.txt
	modified:   README.md
	new file:   test/CMakeLists.txt