lang/c++: added a CMakeLists so we can build all the c++ examples trivially.
lang/c++: added a CMakeLists so we can build all the c++ examples trivially.

In my examples I'm using C++11 & C++14, this means that some compilers (or some
versions of them) won't work. Most importantly, adding CMake into the picture
is convenient. Now, in order to compile C++ examples we will just "cmake . &&
make". This is important because I plan to add more examples.

mssola/programs,mssola/programs,mssola/programs,mssola/programs,mssola/programs,mssola/programs,mssola/programs