add README

README.md

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+# OwnCloud "Infinite Scale"
+
+OCIS is an alternative to OwnCloud/NextCloud which comes with a much more limited
+feature-set, but eliminates the performance and (🤞) stability issues inherent to
+those legacy codebases due to their having been written in PHP. OCIS is written
+in Go and provides a singles static binary, which creates that strict barrier
+between application code and persistent data which has bitten me so many times.
+
+## First run
+If you've just cloned this to a new machine, you have to bootstrap the service:
+
+```console
+$ mkdir -p mounts/{config,data}
+$ docker compose run init
+```
+
+## Subsequent runs
+The application requires nothing special, just a `docker compose up`.