Update README.md

provide a basic description

Author: Sheeproid

README.md

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-# robusta-cli
+# robusta-cli
+
+This project is a CLI tool for [robusta](https://github.com/robusta-dev/robusta) that helps you build a yaml configuration, run diagnostics, and build custom actions and playbooks.
+
+For more infomration, checkout the [robusta installation docs](https://docs.robusta.dev/master/).