Add Kubero to Software Development section (#3916)

Signed-off-by: Gianni Carafa <gianni.carafa@srf.ch>

README.md

@@ -1818,6 +1818,7 @@ _Related: [Automation](#automation)_
 - [Coolify](https://coolify.io/) - An open-source & self-hostable Heroku / Netlify alternative (and even more). ([Demo](https://demo.coolify.io/), [Source Code](https://github.com/coollabsio/coolify)) `Apache-2.0` `Docker`
 - [Dokku](https://dokku.com/) - An open source PAAS alternative to Heroku. ([Source Code](https://github.com/dokku/dokku)) `MIT` `Docker/Shell/Go`
 - [fx](https://github.com/metrue/fx) - A tool to help you do Function as a Service with painless on your own servers. `MIT` `Go`
+- [Kubero](https://www.kubero.dev/) - A self-hosted Heroku PaaS alternative for Kubernetes that implements GitOps. ([Demo](https://demo.kubero.dev/), [Source Code](https://github.com/kubero-dev/kubero)) `GPL-3.0` `K8S/Nodejs/Go`
 - [LocalStack](https://localstack.cloud/) - LocalStack is a fully functional local AWS cloud stack. This includes Lambda for serverless computation. ([Source Code](https://github.com/localstack/localstack)) `Apache-2.0` `Python/Other`
 - [Nhost](https://nhost.io/) - The Open Source Firebase Alternative with GraphQL. Get a database and backend configured and ready in minutes. ([Source Code](https://github.com/nhost/nhost)) `MIT` `Docker/Nodejs/Go`
 - [OpenFaaS](https://www.openfaas.com/) - Serverless Functions Made Simple for Docker & Kubernetes. ([Source Code](https://github.com/openfaas/faas)) `MIT` `Go`