Add bash completion script

[HiddenKeyDev]

Description

Add bash completion support for nm-hotspot commands and options.

Desired behavior

Users should be able to tab-complete commands and options:
\\�ash
nm-hotspot cr # completes to 'create'
nm-hotspot create - # shows -s, -p, -b, --save
\\

Implementation hints

• Create a bash completion script in \completions/nm-hotspot\
• Install to /etc/bash_completion.d/\ or ~/.local/share/bash-completion/completions/\
• Update Makefile to install completion

Difficulty

Medium