Add OpenSSF Scorecard badge to README

[oleksandr-pavlyk]

Adding OpenSSF scorecard badge to the README file.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you opening the PR as a draft?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1507/index.html

[coveralls]

coverage: 90.684%. remained the same
when pulling 0570ced on add-openssf-scorecard-badge
into 5fca9e2 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev3=py310h15de555_27 ran successfully.
Passed: 908
Failed: 1
Skipped: 86

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev3=py310h15de555_28 ran successfully.
Passed: 908
Failed: 1
Skipped: 86

[ndgrigorian]

LGTM, hopefully we will see the badge on Monday

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞