Add rate-limit example

[vepatel]

Proposed changes

• Add an example to configure rate-limit using an Ingress resource.

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d1cee12) 52.28% compared to head (d4b4614) 52.28%.

❗ Current head d4b4614 differs from pull request most recent head c4da0ce. Consider uploading reports for the commit c4da0ce to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4907   +/-   ##
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  Coverage   52.28%   52.28%           
=======================================
  Files          60       60           
  Lines       17501    17501           
=======================================
  Hits         9151     9151           
  Misses       8020     8020           
  Partials      330      330           

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[ADubhlaoich]

LGTM, added two suggestions regarding NGINX as a noun.