chore: Add README (#7)

Author: Techassi

.readme/static/borrowed/Icon_Stackable.svg

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+<!-- markdownlint-disable MD041 MD033 -->
+
+<p align="center">
+  <img width="150" src="./.readme/static/borrowed/Icon_Stackable.svg" alt="Stackable Logo"/>
+</p>
+
+<h1 align="center">Stackable Demos & Stacks</h1>
+
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-green.svg)](https://docs.stackable.tech/home/stable/contributor/index.html)
+
+[Stackable Data Platform](https://stackable.tech/) | [Platform Docs](https://docs.stackable.tech/) | [Discussions](https://github.com/orgs/stackabletech/discussions) | [Discord](https://discord.gg/7kZ3BNnCAF)
+
+A demo is an end-to-end demonstration of the usage of the Stackable data platform. It is tied to a specific stack of the
+Stackable data platform, which will provide the required products for the demo. The list of demos can be browsed either
+via our documentation page [here][demo-overview] or with the `demo list` command of our `stackablectl` tool. More
+information about this command can be found [here][demo-cmd].
+
+A stack is a collection of ready-to-use Stackable data products as well as required third-party services like Postgresql
+or MinIO. It is tied to a specific release of the Stackable data platform, which will provide the required operators for
+the stack. Stacks can be listed using the `stack list` command, see [here][stack-cmd] for more information.
+
+[stack-cmd]: https://docs.stackable.tech/management/stable/stackablectl/commands/stack
+[demo-cmd]: https://docs.stackable.tech/management/stable/stackablectl/commands/demo
+[demo-overview]: https://docs.stackable.tech/home/stable/demos/