adding in express middleware example

[jaredwray]

Please check if the PR fulfills these requirements

• [x] Followed the Contributing guidelines.
• [x] Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• [ ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) adding in express middleware example

[codecov[bot]]

Codecov Report

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

Project coverage is 91.37%. Comparing base (9238da3) to head (2173558).

:exclamation: Current head 2173558 differs from pull request most recent head d604ed7

Please upload reports for the commit d604ed7 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #703 +/- ## ======================================= Coverage 91.37% 91.37% ======================================= Files 8 8 Lines 788 788 Branches 111 111 ======================================= Hits 720 720 Misses 67 67 Partials 1 1 ```

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