doc: add initial README and sample environment files

README.md

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+# Jitsi Meet on Docker
+
+[Jitsi] is a set of Open Source projects that allows you to easily build and deploy secure
+videoconferencing solutions.
+
+[Jitsi Meet] is a fully encrypted, 100% Open Source videoconferencing solution that you can use
+all day, every day, for free — with no account needed.
+
+This repository contains the necessary tools to run a Jitsi Meet stack on [Docker] using
+[Docker Compose].
+
+**NOTE: This is experimental (at the moment) and running on [Swarm mode] is not yet supported.**
+
+## Quick start
+
+In order to quickly run Jitsi Meet on a machine running Docker and Docker Compose,
+follow these steps:
+
+* Create a ``.env`` file by copying and adjusting ``env.example``.
+* Run ``docker-compose up -d``.
+* Access the web UI at ``https://localhost:8443`` (or a different port, in case you edited
+the compose file yourself.
+
+[Jitsi]: https://jitsi.org/
+[Jitsi Meet]: https://jitsi.org/jitsi-meet/
+[Docker]: https://www.docker.com
+[Docker Compose]: https://docs.docker.com/compose/
+[Swarm mode]: https://docs.docker.com/engine/swarm/
+