enhancementhelp wanted
説明
Is your feature request related to a problem? Please describe. When using asdf as a system-wide install (like #577), there isn't a simple way to set system tool versions.
Describe the solution you'd like
I'd like to be able to use a system level versions file, e.g. /etc/tool-versions.
So each user on my machine would have shared defaults.
Like how git supports local, global and system level config, with system config being stored in /etc/gitconfig.
Describe workarounds you've considered
Currently I can symlink a file to ~/.tool-versions for each existing user.