Move license from readme to LICENSE

[max-sixty]

trafficstars

[max-sixty]

I see a few 👍 — but is this def OK? @shoyer maybe this needs your approval

[jhamman]

I think this is probably a good idea, but I didn't do it originally because GitHub does not detect a license as "Apache 2.0" unless the full text matches exactly.

Are we sure this is still the case? I'd be in favor of trying this with the caveat that its probably not worth it if github isn't able to detect the apache license.

[headtr1ck]

I think the most common way to distribute the Apache2 license is to add the original license UNMODIFIED in a LICENSE file and add a NOTICE file that includes the copyright notice (newer versions omit the years in the copyright) and links to the license file.

This would then also be the place to add the addendum.

(Note: I'm not super familiar with this, but that's what I could find online and explained in the license itself! So maybe someone with more expertise should verify this!)