Add README.md

Author: hovsater

README.md

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+# Atom Community Website
+
+Atom Community website powered by [jekyll](https://jekyllrb.com).
+
+## Development
+
+The easiest way to get started is using [Docker](https://www.docker.com).
+
+```console
+$ docker-compose up
+```
+
+If you're not using Docker, see https://jekyllrb.com/docs/ for how to get started.