Diagrams and tests before refactoring

ref1.0

Update .gitignore

Fixed minor issues

Fix include order, typos, '\n' to std::endl, trow char* to throw string

Upgraded release

Changed CMakeList and added info how to build Graph project with CMake in ReadMe

Lab 1, var (1,8) ready for checking

Implemented Graph , DateTime , DateTimeDelta modules.
Added samples and demo main.