Add sponsors to readme

README.md

@@ -2,8 +2,14 @@
 
 This repository is the home of _JUnit 5_.
 
+## Sponsors
+
 [![Support JUnit](https://img.shields.io/badge/%F0%9F%92%9A-Support%20JUnit-brightgreen.svg)](https://junit.org/sponsoring)
 
+* **Gold Sponsors:** [JetBrains](https://jb.gg/junit-logo)
+* **Silver Sponsors:** [Micromata](https://www.micromata.de), [Quo Card](https://quo-digital.jp)
+* **Bronze Sponsors:** [Premium Minds](https://www.premium-minds.com), [Testmo](https://www.testmo.com), [codefortynine](https://codefortynine.com), [Info Support](https://www.infosupport.com), [Stiltsoft](https://stiltsoft.com), [Code Intelligence](https://www.code-intelligence.com)
+
 ## Latest Releases
 
 - General Availability (GA): [JUnit 5.10.2](https://github.com/junit-team/junit5/releases/tag/r5.10.2) (February 4, 2024)