zsh completion script for taskbook

I have written a zsh completion script for taskbook, and i think it can make taskbook‘s operation more fast and convenient. Welcome everyone to try it and give some useful advice. Thanks.

[CuberL/tb-zsh-completion](https://github.com/CuberL/tb-zsh-completion)


Start by reviewing the proposed completion script in CuberL/tb-zsh-completion and comparing it with taskbook’s documented CLI commands. The issue does not identify project files, tests, or an integration plan; done criteria would need to establish supported commands and how the script should be included and verified.

Written by the indexing model from the issue text.