Add a README

Author: foosel

README.md

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+# ✏ OctoPi-UpToDate
+
+*The latest OctoPi release with the latest OctoPrint already included*
+
+This repository automatically updates the OctoPrint installation on the latest OctoPi image
+and provides the resulting image ready to flash. Checkout the [releases](https://github.com/OctoPrint/OctoPi-UpToDate/releases).
+
+## How does this work?
+
+A simple update script is run via [CustoPiZer](https://github.com/OctoPrint/CustoPiZer).
+All that is done is running the equivalend of `pip install -U OctoPrint==<latest version>`.
+
+## Can I do something like this as well?
+
+Sure, check out [CustoPiZer's README](https://github.com/OctoPrint/CustoPiZer) for 
+instructions on how to set up your own image build for modified but clean OctoPi images!