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Contributing.md

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+# Contributing
+
+Thank you very much for your interest in this project!
+
+Contributions are possible by various means.
+
+
+## Feedback
+
+Feedback is very important and most welcome! You can currently use the
+[issue tracker](https://github.com/eikek/docspell/issues/new) or the
+[gitter room](https://gitter.im/eikek/docspell) to leave feedback or
+say hi. You can also access the gitter room using your favorite
+[matrix](https://matrix.org/) client.
+
+If you don't like to sign up to github/matrix or like to reach me
+personally, you can make a mail to `info [at] docspell.org` or on
+matrix, via `@eikek:matrix.org`.
+
+
+## Documentation
+
+The website `https://docspell.org` contains the main documentation and
+is also hosted in this repository. The sources are in `/website`
+folder. It is built using [zola](https://github.com/getzola/zola), a
+static site generator.
+
+If you want to contribute to the documentation, please see the
+[README](https://github.com/eikek/docspell/blob/master/website/README.md)
+in this folder for how to get started. It is recommended to install
+[nix](https://nixos.org/guides/install-nix.html) in order to not
+fiddle with dependencies.
+
+The main content is in `/website/site/content` and sibling directories.
+
+There are always two versions of the website: the currently released
+version and the development version (which is becoming the next
+release). If you want to contribute to the current docs, please base
+your PR off the `current-docs` branch.
+
+
+## Code
+
+Code is very welcome, too, of course.
+
+If you want to work on something larger, please create an issue or
+let's discuss it on gitter first.
+
+The backend of docspell is written in [Scala](https://scala-lang.org)
+using a pure functional style. It builds on great libraries from the
+[typelevel](https://typelevel.org) ecosystem, i.e.
+[cats](https://typelevel.org/cats), [fs2](https://fs2.io),
+[doobie](https://tpolecat.github.io/doobie/) and
+[http4s](https://http4s.org/). The backend consists of two components:
+a http/rest server and the job executor, both running in separate
+processes.
+
+The web frontend is written in [Elm](https://elm-lang.org), which is a
+nice functional language that compiles to javascript. The frontend is
+included in the http/restserver component. The CSS is provided by
+[Fomantic-UI](https://fomantic-ui.com/), where a [custom
+build](https://github.com/eikek/fomantic-slim-default) of it is used
+to avoid dependency to a google font and jquery (all javascript
+modules are removed).
+
+The [development](https://docspell.org/docs/dev/building/) page
+contains some tips to get started.