Adjustments to README (#20494)

Automatic Merge

README.md

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 [Mattermost](https://mattermost.com) is an open source platform for secure collaboration across the entire software development lifecycle. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React and runs as a single Linux binary with MySQL or PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
 
+[Use it for free in Mattermost Cloud](https://mattermost.com/sign-up/?utm_source=github-mattermost-server-readme) or [deploy on-premises](https://mattermost.com/deploy/?utm_source=github-mattermost-server-readme).
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 <img width="1006" alt="mattermost-hero" src="https://user-images.githubusercontent.com/7205829/136107976-7a894c9e-290a-490d-8501-e5fdbfc3785a.png">
 
-Useful resources:
+Learn more about the following use cases with Mattermost:
+
+- [DevSecOps](https://mattermost.com/solutions/use-cases/devops/?utm_source=github-mattermost-server-readme)
+- [Incident Resolution](https://mattermost.com/solutions/use-cases/incident-resolution/?utm_source=github-mattermost-server-readme)
+- [IT Service Desk](https://mattermost.com/solutions/use-cases/it-service-desk/?utm_source=github-mattermost-server-readme)
+
+Other useful resources:
 
 - [Download and Install Mattermost](https://docs.mattermost.com/guides/deployment.html) - Install, setup, and configure your own Mattermost instance.
 - [Product documentation](https://docs.mattermost.com/) - Learn how to run a Mattermost instance and take advantage of all the features.