Add a README file.

Author: dead-claudia

README.md

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+# Mithril.js documentation
+
+This is the documentation for [Mithril.js](https://github.com/MithrilJS/mithril.js), hosted at [mithril.js.org](https://mithril.js.org).
+
+## Contributing
+
+There's a [Contributing FAQ](https://mithril.js.org/contributing.html) on the Mithril.js site that hopefully helps, but if not definitely hop into the [Zulip stream](https://mithril.zulipchat.com/) and ask away!
+
+## Getting Help
+
+Mithril.js has an active & welcoming community on [Zulip](https://mithril.zulipchat.com/), or feel free to ask questions on [Stack Overflow](https://stackoverflow.com/questions/tagged/mithril.js) using the `mithril.js` tag.