Add the IntToString module and the GetCurrentTime module.
Add the implement of the Logging class except the GetCurrentDate
function.
Add the implement of the Logging::GetCurrentDate function and the
comment of the member function of the Logging class.
Transfer the definition of the templete member function
Logging::operator << to the header file.
Add the unit test for the Logging function.
Add the license file and the readme file.