Propose akka and akka-http for Open Source Spree

[jrudolph]

Hey! A bit late to the party but I hope it's not too late to offer to be there to support potential Akka / Akka HTTP contributors.

[jrudolph]

Links to potential tickets (still triaging to provide a bit more choice):

• Akka: https://github.com/akka/akka/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Ahackathon
• Akka HTTP: https://github.com/akka/akka-http/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Ahackathon