add install notes about how to use with oh my zsh
add install notes about how to use with oh my zsh

micha/resty,AdrieanKhisbe/resty,AdrieanKhisbe/resty,micha/resty,AdrieanKhisbe/resty,AdrieanKhisbe/resty,micha/resty,AdrieanKhisbe/resty,micha/resty,micha/resty