Add `a` and `rounded` themes
Add `a` and `rounded` themes

- https://github.com/chammanganti/a-zsh-theme/issues/1 is closed, add `a` theme.
- https://github.com/daniilty/rounded-zsh-theme/issues/1 is closed, add `rounded` theme

Signed-off-by: Joe Block <13bb081c6ac072ef78a3e348068e2204400d7335@unixorn.net>

unixorn/awesome-zsh-plugins,voronkovich/awesome-zsh-plugins