Add OpenSSF Scorecard where available

[ryjones]

These are the existing scorecards.

[baentsch]

As this is now publicly available, I'd strongly suggest working on improving those scores that are published (create issues in those sub projects?).

[dstebila]

Agreed. I believe it was an action item for @planetf1 to add issues for these in the respective repositories.

[planetf1]

I opened open-quantum-safe/tsc#27 for followup actions across other repos. Comments welcome there!

[baentsch]

I opened open-quantum-safe/tsc#27 for followup actions across other repos. Comments welcome there!

I do not think this was the (t)ask: I think the idea was to have single issues open (and resolve them) in each of those sub projects where you already publish scores (liboqs, liboqs-go and liboqs-rust) to clear them out before creating more bad impressions about the "security score" of further OQS sub projects.