Add seamile/mu-zsh-theme

Add `seamile/mu-zsh-theme` theme

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

README.md

@@ -2247,6 +2247,7 @@ If you're using [Antigen](https://github.com/zsh-users/antigen), you can test th
 - [moonline](https://github.com/kagamilove0707/moonline.zsh) - Minimal but easily extensible prompt.
 - [moux](https://github.com/gagbo/moux) - Works well with a dark terminal background, includes `git` decorations in `RPROMPT`.
 - [msys2](https://github.com/water-logger/MSYS2-Theme/) - Inspired by MSYS2. Includes decorators for user@host, `git` status and the current directory.
+- [mu](https://github.com/seamile/mu-zsh-theme) - Improves display of multiple `git` statuses. Inspired by [lambda mod theme](https://github.com/halfo/lambda-mod-zsh-theme). Requires a powerline-compatible font.
 - [multi-shell-repo-prompt](https://github.com/dotcode/multi-shell-repo-prompt) - Provides useful information (in your prompt) about the repository that you are in. It currently works for [Git](https://git-scm.com/) and [Mercurial](https://www.mercurial-scm.org/), under [ZSH](https://en.wikipedia.org/wiki/Zsh) as well as [bash](https://en.wikipedia.org/wiki/Bash_%28Unix_shell%29).
 - [multiline](https://github.com/jan-auer/zsh-multiline) - Powerline-esque theme based on [agnoster](https://github.com/agnoster/agnoster-zsh-theme).
 - [muslim](https://github.com/nksoff/muslim) - A simple minimal ZSH prompt theme.