code: def add(self, alias: str, config: dict) -> None:
          
          self._config[alias] = config
docs: Add a cache to the current config. If the key already exists, it
          will overwrite it::
  
              >>> caches.add('default', {
                      'cache': "aiocache.SimpleMemoryCache",
                      'serializer': {
                          'class': "aiocache.serializers.StringSerializer"
                      }
                  })
  
          :param alias: The alias for the cache
          :param config: Mapping containing the cache configuration