Add Scorecard badge to readme

[diogoteles08]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

This PR adds the badge of OpenSSF Scorecard to the README of the project. It's a recent feature, has been adopted by many big projects already and helps showing off your hard work to improve security practices. Badges are especially useful for maintainers, who will be able to assess dependencies at a glance, and adopting it encourages new adopters of Scorecards and help raise the collective level of open source security.

Any doubts or questions please feel free to reach out to me.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[jessicajaniuk]

@diogoteles08 Can you fix your commit messages scopes? It looks like you have types but not scopes, which is causing our lint check to fail. They're the thing that goes in the (). You can find a list of valid scopes in the CONTRIBUTING.md file.

[diogoteles08]

Sure! Will do that

[diogoteles08]

Hi! I was able to fix the commit message issues, but seems like I'm getting another error on CircleCI that I don't think was caused by my changes. It says Sauce Connect Proxy failed to start.. Should I do anything about that?

[josephperrott]

After consideration and discussing within the team, we determined we actually do not want to include the scorecard badge in our readme as the information is not actionable or inherently useful for our community without a lot of additional understanding and context.

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