docs: first draft for doc website

docs/README.md

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+![Latest Build](https://img.shields.io/github/actions/workflow/status/acouvreur/sablier/build.yml?style=flat-square&branch=main)![Go Report](https://goreportcard.com/badge/github.com/acouvreur/sablier?style=flat-square) ![Go Version](https://img.shields.io/github/go-mod/go-version/acouvreur/sablier?style=flat-square) ![Latest Release](https://img.shields.io/github/release/acouvreur/sablier/all.svg?style=flat-square)
+
+# Sablier - Scale to Zero
+
+Sablier is an API that start containers for a given duration.
+
+It provides an integrations with multiple reverse proxies and different loading strategies.
+
+Which allows you to start your containers on demand and shut them down automatically as soon as there's no activity.
+
+![Hourglass](https://raw.githubusercontent.com/acouvreur/sablier/main/docs/img/hourglass.png)
+
+## Glossary
+
+I'll use these terms in order to be provider agnostic.
+
+- **Session**: A Session is a set of **instances**
+- **Instance**: An instance is either a docker container, docker swarm service, kubernetes deployment or kubernetes statefulset
+
+## Credits
+
+- [Hourglass icons created by Vectors Market - Flaticon](https://www.flaticon.com/free-icons/hourglass)
+- [tarampampam/error-pages](https://github.com/tarampampam/error-pages/) for the themes