📝 : add README.md

Author: juwit

README.md

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+# gaia-runner
+
+gaia-runner is the service that runs the Terraform jobs in Gaia.
+
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=gaia-app%3Arunner&metric=alert_status)](https://sonarcloud.io/dashboard?id=gaia-app%3Arunner)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=gaia-app%3Arunner&metric=coverage)](https://sonarcloud.io/dashboard?id=gaia-app%3Arunner)
+![Docker Pulls](https://img.shields.io/docker/pulls/gaiaapp/runner)
+
+## What is it?
+
+Gaia is a web application to import and run your Terraform modules. See [Gaia on Github](https://github.com/gaia-app/gaia).
+
+This service works in conjonction with Gaia.
+
+It features : 
+* running modules (plan/apply/destroy) in a dedicated docker container
+* publish state to Gaia
+
+## Documentation
+
+Go to [docs.gaia-app.io](https://docs.gaia-app.io) for the full documentation.
+
+## Requirements
+
+Gaia-runner needs :
+ * a docker daemon (used to run Terraform itself)
+ * a running Gaia instance
+
+## Quick start
+
+See the documentation at [https://docs.gaia-app.io/](https://docs.gaia-app.io/getting-started/quick-start/) for quick-start instructions.
+
+## Contributors
+
+Gaia is made with ❤️ in  🇫🇷 by [Cyril DUBUISSON](https://github.com/cdubuisson) and [Julien WITTOUCK](https://github.com/juwit)