Building a repository of classroom materials for SPE/PDC

[behoppe]

For some time, @jowens has recommended that the Fastcode OSE prioritize building a repository of SPE classroom materials. The key context around the repository is an instructors' "circle of trust," which would be enabled by features like high-quality content, solid access control (to keep sensitive material secure), and commitments from users to share and contribute back.

I am creating this issue to invite collaboration on this topic. In particular, @libbyshoop and @joeladams are right now actively working on a similar CSinParallel repository for PDC teaching materials, while the Fastcode teachers' community repository remains in the early-prototype phase (as described here: #192).

@jowens, @libbyshoop, and @joeladams, I hope you agree that these two efforts could benefit by sharing notes with each other. Libby and Joel, perhaps you might say a bit about where your work stands?