Just place ryner.zsh-theme at ~/.oh-my-zsh/themes/
Then add ZSH_THEME="ryner" to your ~/.zshrc (Attention! Do not allow to have more than 1 ZHS_THEME field in your ~/.zshrc file). You might want to use FiraCode font with awesome ligatures in your terminal (https://github.com/tonsky/FiraCode)
