Coordinating translation updates

[nbarbettini]

I'm really excited that folks are interested in translating this book to more languages. Since I plan to update the book occasionally (with both small and large changes), I think we should discuss how to keep the translated versions in sync with the original.

Here's my suggestion for translation forks:

• Maintain a master branch on your profile that doesn't contain any changes, but just serves as a diff against nbarbettini:master.
• Keep the translation in another fork, like zh-cn or de-DE.
• When the original book is updated, nbarbettini:master will move ahead of your master. This will make it really obvious what needs to be updated in the translation. When the translation fork has been updated, translator:master can be fast-forwarded to catch up with nbarbettini:master.

@windsting took this approach in his Chinese translation: https://github.com/windsting/little-aspnetcore-book

Open to any better suggestions!

cc:
@xleon
@duke1102
@sahinyanlik
@windsting
@atsvetkov
(Apologies if I missed anyone!)