docs(README): link CRDS PUB

[guspan-tanadi]

Resolves a link in main README

Closes #

This PR addresses CRDS PUB link user documentation in README

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• [ ] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• [ ] added relevant milestone
• [ ] added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
• [ ] All comments are resolved
• [ ] Make sure the JIRA ticket is resolved properly

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.23%. Comparing base (79b1da8) to head (9e87522).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8658 +/- ## ======================================= Coverage 60.23% 60.23% ======================================= Files 370 370 Lines 38636 38636 ======================================= Hits 23272 23272 Misses 15364 15364 ```

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[nden]

Thank you!