[HttpKernel][Console] Add Les-Tilleuls.coop as a backer to the README

Author: nicolas-grekas

README.md

@@ -5,6 +5,18 @@ The HttpKernel component provides a structured process for converting a Request
 into a Response by making use of the EventDispatcher component. It's flexible
 enough to create full-stack frameworks, micro-frameworks or advanced CMS systems like Drupal.
 
+Sponsor
+-------
+
+The HttpKernel component for Symfony 5.4/6.0 is [backed][1] by [Les-Tilleuls.coop][2].
+
+Les-Tilleuls.coop is a team of 50+ Symfony experts who can help you design, develop and
+fix your projects. We provide a wide range of professional services including development,
+consulting, coaching, training and audits. We also are highly skilled in JS, Go and DevOps.
+We are a worker cooperative!
+
+Help Symfony by [sponsoring][3] its development!
+
 Resources
 ---------
 
@@ -13,3 +25,7 @@ Resources
  * [Report issues](https://github.com/symfony/symfony/issues) and
    [send Pull Requests](https://github.com/symfony/symfony/pulls)
    in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/backers
+[2]: https://les-tilleuls.coop
+[3]: https://symfony.com/sponsor