to add documentation on packages/osd-stylelint-plugin-stylelint (open…

…search-project#5632)

* adding documentation on files in util in addition to a README.md with an overview of each file and its exported functions

---------

Signed-off-by: tanupa <tanupa01@gmail.com>
Co-authored-by: Josh Romero <rmerqg@amazon.com>

CHANGELOG.md

@@ -283,6 +283,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### 📝 Documentation
 
+- added js documentation and a readme file to files in utils folder ([#5540])(https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5540/)
+
 ### 🛠 Maintenance
 
 - Adding @ZilongX and @Flyingliuhub as maintainers. ([#4137](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4137))