add open source policy to this site

[oskapt]

add the open source policy from opensource.suse.com into this page

[dirkmueller]

great idea, @oskapt - @rjschwei might be able to help with that. I would like to add that we could potentially merge this back into suse.github.io / opensource.suse.com going forward, which would essentially mean pull requesting the current site to https://github.com/SUSE/suse.github.io