Add IndexedDB 3.0

[Schweinepriester]

https://en.wikipedia.org/wiki/Indexed_Database_API

IndexedDB 3.0 is currently a First Public Working Draft.^[1]^

https://github.com/w3c/IndexedDB/

This is a repository for the development of the Indexed Database (Third Edition) specification.

• Latest Editor's Draft

→

• Spec: https://www.w3.org/TR/IndexedDB/ or https://w3c.github.io/IndexedDB/