docs: def add(self, name, path=None, **kwargs):
          """add new project with given name and path to database
          if the path is not given, current working directory will be taken
          ...as default
          """
          path = path or kwargs.pop('default_path', None)
  
          if not self._path_is_valid(path):
              return
  
          if not self._is_unique(name, path):
              p = Project.select().where(
                  (Project.name == name) |
                  (Project.path == path)
              )[0]
              self._print(self._ERROR_PROJECT_EXISTS.format(name, p.path), 'red')
              return
  
          Project.create(name=name, path=path)
          self._print(self._SUCCESS_PROJECT_ADDED.format(name), 'green')