docs: def add_project(self, path):
          """
          Adds a project.
  
          :param path: Project path.
          :type path: unicode
          :return: Method success.
          :rtype: bool
          """
  
          if not foundations.common.path_exists(path):
              return False
  
          path = os.path.normpath(path)
          if self.__model.get_project_nodes(path):
              self.__engine.notifications_manager.warnify(
                  "{0} | '{1}' project is already opened!".format(self.__class__.__name__, path))
              return False
  
          LOGGER.info("{0} | Adding '{1}' project!".format(self.__class__.__name__, path))
          project_node = self.__model.register_project(path)
          if not project_node:
              return False
  
          self.__model.set_project_nodes(project_node)
          return True