Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Not going to give you a keychain file.
But I exported all the root certificates to a certificate bundle by selecting them all and clicking export:
https://drive.google.com/file/d/0B6oAkb_UroZtTy1FZDJrTk1meFk/edit?usp=sharing