`git-secret-add` adds a filepath(es) into the `.gitsecret/paths/mapping.cfg`. When adding files, ensure that they are ignored by `git`, since they must be secure and not be commited into the remote repository unencrypted.
If there's no users in the `git-secret`'s keyring, when adding a file, an exception will be raised.
It is not recommened to add filenames directly into the `.gitsecret/paths/mapping.cfg`, use the command.