Update README.md

Co-Authored-By: JehanKandy  <jehankandy@gmail.com>
Co-Authored-By: Vinura Pathirana <154809219+VinuraPathirana@users.noreply.github.com>
Co-Authored-By: Anupa Gamage <125038143+anupa1998@users.noreply.github.com>

Author: 4 people

README.md

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 All previous releases in [JKCSS](https://github.com/JKCSS/JKCSS-Framework)
 
+- Utility-First CSS Framework 
+
 - The JKCSS is a one of CSS Frameworks. and JKCSS underdevelopment. Any person who likes Web development and design feel free to use this Framework
 
 - Current Release : [v6.0.0 - 05 May 2024 Latest](https://github.com/JKCSS-CSS-Framework/JKCSS-Framework/releases/tag/v6.0.0)