Add foxit64/zsh-theme-rio

Add `foxit64/zsh-theme-rio` theme. Closes foxit64/zsh-theme-rio#1

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

Author: unixorn

README.md

@@ -2806,6 +2806,7 @@ These plugins add tab completions without adding extra functions or aliases.
 - [ribbon](https://github.com/pyjamafish/ribbon-prompt) - Reminiscent of powerline. Includes Python `virtualenv` decorator.
 - [rie](https://github.com/andrii-rieznik/rie-zsh-theme) - Minimalist theme with decorators for username, `git` status and current directory.
 - [rigel](https://github.com/othiagos/rigel-zsh-theme/) - Includes decorators for `git` information, user@hostname and current directory.
+- [rio](https://github.com/foxit64/zsh-theme-rio) - Minimalist theme with decorators for `git` status and current directory.
 - [risbow](https://github.com/waddupp00/risbow) - A [risto](https://github.com/ohmyzsh/ohmyzsh/blob/master/themes/risto.zsh-theme) inspired ZSH theme with a lolcat like rainbow effect.
 - [ritz](https://github.com/Ritzier/ritz.zsh-theme) - Includes decorators for time, current directory, `git` status, exit status and time used for last command run.
 - [river](https://github.com/revir/river-zsh-config) - Dark theme with `git` information.