If a user sees the error message during git clone, “Permission
denied (publickey).fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.”,
If user's macOS shows, “xcode-select: note: no developer tools were
found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.”
download commandline as instructed (this may take ~7 minutes)