add suport to add users

session_manager.cpp

@@ -60,3 +60,10 @@ std::list<std::string> session_manager::get_users_info(){
     }
   return ret;
 }
+
+void session_manager::create_user(std::string username, std::string password, bool admin){
+  this->con->write_string("cusr");
+  this->con->write_string(username);
+  this->con->write_string(password);
+  this->con->write_string(admin?"t":"f");
+}