feat(cli): added supported for shell completions

[rootCircle]

Introduction

Added opt-in shell completions support for bash, zsh and fish shells

Generating completions

1.  auto-cpufreq --completions=zsh # shell name

2. Copy the displayed command and run it once! Voila! you have the completions working
3. Restart the shell or source <rc-file>

Screenshots

Resources

• Click lib docs

[AdnanHodzic]

@rootCircle lgtm!

Couple of remarks:

1: let's add explanation of --completions flag to https://github.com/AdnanHodzic/auto-cpufreq/#how-to-run-auto-cpufreq

2: Why not suggest "Restart the shell or source " part here:

sudo auto-cpufreq --completions=zsh
Run the below command in your current shell!

echo 'eval "$(_AUTO_CPUFREQ_COMPLETE=zsh_source auto-cpufreq)"' >> ~/.zshrc
source ~/.zshrc

Think it would be a better flow.

[rootCircle]

Why not suggest "Restart the shell or source " part here:

Yes, this will be more elegant from user POV, I am making the required changes :-)

[AdnanHodzic]

Why not suggest "Restart the shell or source " part here:

Yes, this will be more elegant from user POV, I am making the required changes :-)

Perfect :)