1- start git bash 2- use zsh-bin to get zsh wget
sh -c "$(wget -O- https://raw.githubusercontent.com/romkatv/zsh-bin/master/install)"
curl
sh -c "$(curl -fsSL https://raw.githubusercontent.com/romkatv/zsh-bin/master/install)"
3- start zsh in your ~/.bashrc
if [ -t 1 ]; then
exec $path_to_zsh
fi