Add examples configs

[sudo-black]

@agkozak Great works, this has been great for me. Please add some example .zshrc file in this repo. Just to make life easier when getting started.

Thanks.

[sudo-black]

@agkozak I have created a PR for this, please review and let me know if I can improve this in any way.

PS I am willing to contribute towards a multiple .zshrc file manager for zcomet, similar in functionality to oh-my-zsh's theme selector.