Add bash completion for fpm response file: fpm.rsp

[gha3mi]

Hi,

This PR references issue #4.

Here is an example of what I used for an fpm.rsp file: https://github.com/gha3mi/forbenchmark/blob/main/fpm.rsp.

Theoretically, you define your commands with @command followed by fpm options in the fpm.rsp file located in the same path as the fpm.toml file.

For more information, you can find it by running fpm --help or visiting https://urbanjost.github.io/M_CLI2/set_args.3m_cli2.html.

Thanks,
Ali

[ShinobuAmasaki]

Thank you for your pull request.
This PR have merged to main branch.

Thanks.