Simple git theme for oh-my-zsh, inspired from gitstatus

* Record using darkside color presets

1. wget -O $ZSH_CUSTOM/themes/simple-git.zsh-theme https://raw.githubusercontent.com/BazaJayGee66/simple-git-theme/master/simple-git.zsh-theme
2. vim ~/.zshrc
3. Set ZSH_THEME="simple-git"