[README] Add example of minimal .zshrc.
[README] Add example of minimal .zshrc.

tarruda/zsh-autosuggestions,zsh-users/zsh-autosuggestions,ascenator/zsh-autosuggestions,joshuarubin/dotfiles,zsh-users/zsh-autosuggestions,joshuarubin/dotfiles,joshuarubin/dotfiles,joshuarubin/dotfiles