Add Spectere/spectere-omz-theme

Add `Spectere/spectere-omz-theme` theme. Closes Spectere/spectere-omz-theme#1

Signed-off-by: Joe Block <[email protected]>

README.md

@@ -2556,6 +2556,7 @@ If you're using [Antigen](https://github.com/zsh-users/antigen), you can test th
 - [solarized-powerline (houjunchen)](https://github.com/houjunchen/solarized-powerline) - Solarized powerline-style theme for ZSH.
 - [solarizsh](https://github.com/paddykontschak/Solarizsh) - Color fix for robbyrussell's oh-my-zsh theme to work with [solarized](https://github.com/altercation/solarized) terminals.
 - [spaceship](https://github.com/denysdovhan/spaceship-prompt) - Theme with `git`, `nvm`, rvm/rbenv/chruby, python, `ssh` and other useful status decorators.
+- [spectere](https://github.com/Spectere/spectere-omz-theme) - Powerline-esque. Includes decorators for current directory, root status, and `git` status.
 - [spowerline](https://mbauhardt.github.io/spowerline/) - Written in scala, inspired by [Agnoster](https://github.com/agnoster/agnoster-zsh-theme), [tmux](https://tmux.github.io) powerline, vim powerline and the vim status plugin.
 - [spyrhoo](https://github.com/FajarKim/spyrhoo-zsh-theme) - Includes time, `git` and current directory decorations.
 - [ssfprompt](https://github.com/hugoh/zsh-ssfprompt) - Simple, slim, fast. Includes `ssh`, virtualenv and vcs decorations.