code: def create_collection(self, name):
          
          assert self.is_collection
          self._check_write_access()
          collpath = self._getFilePath(name)
          os.mkdir(collpath)
          filepath = self._getFilePath(name, ".directory")
          f = open(filepath, "w")
          f.write("Created by WsgiDAV.")
          f.close()
          commands.add(self.provider.ui, self.provider.repo, filepath)
docs: Create a new collection as member of self.
  
          A dummy member is created, because Mercurial doesn't handle folders.