Add OpenSSF Scorecards

[adityasaky]

We should add OpenSSF scorecard to this repository.

Reference: https://github.com/ossf/scorecard

[viveksahu26]

Hey @adityasaky, could you please assign me this? I want to work on it.

[viveksahu26]

Hey @adityasaky, a question, should we also register this project to OpenSSF Best practice.

[adityasaky]

Hey @adityasaky, a question, should we also register this project to OpenSSF Best practice.

I'm not sure. We have in-toto/in-toto registered already. We ought to reevaluate this in the context of witness / go-witness as well. cc @jkjell