зарегистрируйте содержимое файла в рабочем дереве в индекс (Register file contents in the working tree to the index)
Описание (Description)
Modifies the index. Each file mentioned is updated into the index
and any unmerged or needs updating state is cleared.
See also git-add(1) for a more user-friendly way to do some of
the most common operations on the index.
The way git update-index handles files it is told about can be
modified using the various options:
