Add bash completion

[silentboatman]

To use bash completion: Rename 'bash_tealdeer' to 'tldr' and move it
to /usr/share/bash-completion/completions/ .

[dbrgn]

This is nice! Some questions:

• The file contains some of the completions hardcoded in. Would there be a way to generate this through docopt?
• Are there any conventions on how these files are handled in projects? We probably can't distribute this file through cargo install, but maybe we can make the life for packaging as easy as possible.

[silentboatman]

I haven't worked with docopt. But the only way that I can think of to get rid of the hard coded os types is to add a flag to tealdeer that lists them. Something like tldr --list-os.

Alot of programs add their bash completion file directly to the bash-completion projet. But that's maybe not the best solution in this case, since there are several tldr programs with (I suppose) different flags..

I haven't seen any standard place were people put their completion files.. but here's some different packages and were they put it in:

• pacman /scripts/completion/
• exa /contrib/
• systemd /shell-completion/bash/
• task /scripts/bash/
• ninja /misc/
• colord /data/

[dbrgn]

Sorry for the long delay, and thanks!