README: Add quick install script for OMZ #343
                
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This pull request adds a script to README.md that allows for automatic installation of the Bullet Train theme. This script is copied from my dotfiles used to set up new Linux/macOS terminal environments.
This four line script does the following:
~/.zshrcand$ZSH_CUSTOM/themesexist)$ZSH_CUSTOM/themes/bullet-train.zsh-themeZSH_THEMEto the proper value in~/.zshrc(and changessed -itosed -i ''on macOS for compatibility reasons)~/.zshrcto activate the promptI have tested this script on macOS 13.2.1 (
zsh 5.8.1 (x86_64-apple-darwin22.0)) and Ubuntu 22.04 (zsh 5.8 (x86_64-ubuntu-linux-gnu)).