A new plugin for oh-my-zsh: easy zsh named directory management

This plugin allows the user to create, change, and delete named directories easily. It also provides an autocompletion function, and a function called folder_name() that can be included in PROMPT to show the user all the names of the current folder (not including default names such as '~' or '~user').

It stores the bookmarks in the file ``$HOME/.zshbookmarks`` by default, but this is customizable.

I have used this function for years since I first wrote it, and I think the community could benefit from it :)

Happy to change anything.