Added the scorecard github action and its badge

[harshitasao]

Fixes knative/community#1592

Proposed Changes

PR to add the Scorecard GitHub Action and its badge in the README file.

Release Note

NONE

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: harshitasao
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[knative-prow]

Welcome @harshitasao! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

Hi @harshitasao. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[harshitasao]

cc @davidhadas

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.46%. Comparing base (c51ee6c) to head (e17210f).
Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15473      +/-   ##
==========================================
+ Coverage   84.44%   84.46%   +0.02%     
==========================================
  Files         219      219              
  Lines       13608    13608              
==========================================
+ Hits        11491    11494       +3     
+ Misses       1744     1743       -1     
+ Partials      373      371       -2     

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[skonto]

/ok-to-test

[skonto]

@davidhadas gentle ping

[davidhadas]

@harshitasao

I suggest we separate this PR into 2 parts:

First, lets add the Scorecard GitHub Action << I am ok with the suggested changed to .github
(also, if you have a way to add a comment in the Scorecard indicating "this scorecard is under community evaluation" - please do so, can it be done by changing the scoreboard title?)

Then, lets resolve all pending issues with the Scorecard such as those indicated in #15474

Last, when the community is ok with the Scorecard, we can add the comment and badge to the community readme file.

I therefore suggest to remove the changes to the readme (and badge) from this PR and add it in a future PR when the Scorecard is community approved.