group.hpp - initialization of &server_
user.hpp - corrected constructor param (std::shared_ptr to reference)
error: using add_participant_ instead of add_participant
misspell: srv -> svr
user.cpp - removed using std::move while adding messages to message_queue
new test files
server::get_default_user_name_()
participant::get_server (new method)
server::get_logger (new method)
user - logging information about messages and passing them to processing in server