tab completion for the teensy_loader_ci

At the moment there's a zsh completion file, others might be added in the future.

You might want to familiarize yourself with the fpath variable of the zsh completion system, e.g. in this guide.

One way of using it: create the directory ${HOME}/.local/share/zsh/completions, add it to $fpath and put _teensy_loader_cli there:

mkdir -p ${HOME}/.local/share/zsh/completions
cp _teensy_loader_cli ${HOME}/.local/share/zsh/completions

add the line

fpath=(${HOME}/.local/share/zsh/completions $fpath)

somewhere before autoload -Uz compinit; compinit. (I guess this depends strongly on how your .zshrc is arranged).

There may be better ways for future maintenance and pulling updates. Also you might already have custom completions or are looking for system wide installations, … or I might port the completion to other completion repositories. So be aware this is just one of many options of using the completion. Feel free to implement a better one.