Add HttpsRedirection and Hsts middleware documentation

[jkotalik]

We just added a new set of middleware (aspnet/BasicMiddleware#264) that will Redirect HTTP to HTTPS and Add the Strict-Transport-Security header to HTTPS responses. We need documentation by 2.1 for this. It should be straightforward. I can write a draft for the documentation.

This would go in the "Enforcing SSL" section or in parallel to it.

[scottaddie]

@jkotalik Please let me know when the draft is ready, and I'll work with you to get it published.

[scottaddie]

@jkotalik What's the status of the draft?

[jkotalik]

I'll get on this within the next week or so. The design is fairly hardened now so I can properly document it. @danroth27 would you prefer to combine all Https documentation into the same doc or keep this separate?

[Rick-Anderson]

@danroth27 can you comment?

[Rick-Anderson]

@jkotalik how is the doc doing? @danroth27 see a question for you.

[danroth27]

Same doc seems fine to me.

[Rick-Anderson]

@jkotalik let me know when you have a draft of the article or when you'll have time to work on it. I can do the editing and polish it off.

[jkotalik]

Thanks @Rick-Anderson ❤️