Create a trove-specs repository

This patch creates a trove-specs repository which will be used for
design specifications for the Trove project. Starting with the Kilo
release, all Trove blueprints will need to have a corresponding spec
in this repository.

Change-Id: I439891751b21c3fcc958574f8b272d51bcb0bf2a
Merge "Create a trove-specs repository"