Describe how to contribute

doc/Contributing.md

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+This document describes the way you can contribute to the restic
+project.
+
+Ways to help out
+================
+
+Thank you for your contribution!
+
+There are several ways you can help us out. First of all code
+contributions and bugfixes are most welcome. However even "minor"
+details as fixing spelling errors, improving documentation or pointing
+out usability issues are a great help also.
+
+The restic project uses the github infrastructure ([project page][1])
+for all related discussions as well as the '#restic' channel on
+irc.freenode.net.
+
+If you want to find an area that currently needs improving have a look
+at the open issues listed at the [issues page][2]. This is also the
+place for discussing enhancement to the restic tools.
+
+Providing patches
+=================
+
+You have fixed an annoying bug or have added a new feature? Very cool!
+Let's get it into the project! First we would kindly ask you to fork
+our project on github if you haven't done so already.
+
+The restic project uses the *gofmt* tool for go source indentation, so
+please run
+
+    gofmt -w **/*.go
+
+in the project root directory before commiting.
+
+Then commit your changes as fine grained as possible, as smaller
+patches, that handle one and only one issue are easier to discuss and
+merge.
+
+Please provide the patches for each bug or feature in a separate
+branch and open up a pull request for each.
+
+Code review
+===========
+
+The restic project encourages actively reviewing the code, as it will
+store your precious data, so it's not uncommon to recieve comments on
+provided patches.
+
+If you are reviewing other contributor's code please consider the
+following when reviewing:
+
+* Be nice.
+* Please make the review comment as constructive as possible so all
+  paticipants will learn something from your review.
+
+As a contributor you might be asked to rewrite portions of your code
+to make it fit better into the upstream sources.
+
+[1]: https://github.com/restic/restic/
+[2]: https://github.com/restic/restic/issues