add whipclientsink instructions to the README

[codecov[bot]]

Codecov Report

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

Project coverage is 54.91%. Comparing base (75ae2f4) to head (51d0f1b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3276 +/- ## ========================================== - Coverage 54.94% 54.91% -0.03% ========================================== Files 153 153 Lines 18294 18294 ========================================== - Hits 10051 10047 -4 - Misses 7419 7423 +4 Partials 824 824 ```

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[github-actions[bot]]

This issue is mentioned in release v1.8.0 🚀 Check out the entire changelog by clicking here