add readme

Author: phm07

docs/README.md

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+# Documentation
+
+Welcome to the documentation for the **Hetzner Cloud CLI**.
+
+This documentation is written and organized following the [Diátaxis](https://diataxis.fr/) guidelines. Below you can find a high-level overview of where to look for certain things:
+
+- [Tutorials](tutorials)
+- [Guides](guides)
+- [Reference](reference)
+
+## Getting help
+
+- 🐛 Report bugs using [our issue tracker](https://github.com/hetznercloud/cli/issues/new?issuable_template=bug-report).
+- 🙋 If you need help, reach us using the [Support Center](https://console.hetzner.cloud/support).