Domain-wide installation of Add-ons
This has been a top feature request since we launched add-ons, and I'm so happy to see this launch. With this change, you can now do two things:
1) List your existing add-ons on the Google Apps Marketplace, allowing domain administrators to install your add-on for an entire domain with just a couple clicks.
2) Bundle an add-on with an existing Google Apps Marketplace listing, so that when an administrator installs your application they get your add-on too, giving their users a more immersive experience.
See the blog post below for information on how to get started, and check out the general product announcement here: http://googleforwork.blogspot.com/2015/03/enhanced-add-ons-experience-for-Google-Docs-admins-and-developers.html