Add contributor guide

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diff --git a/README.markdown b/README.markdown
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@@ -107,6 +107,7 @@ Documentation
 
 ### Contributors
 
+- [Contributor guide](docs/contributing.markdown)
 - [Translations](docs/translations.markdown)
 - [Coding standards](docs/coding-standards.markdown)
 - [Running tests](docs/tests.markdown)
diff --git a/docs/contributing.markdown b/docs/contributing.markdown
new file mode 100644
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@@ -0,0 +1,69 @@
+Contributor Guidelines
+======================
+
+How can I help?
+---------------
+
+Kanboard is not perfect but there is many ways to help:
+
+- Give feedback
+- Report bugs
+- Add or update translations
+- Improve the documentation
+- Writing code
+- Tell your friends that Kanboard is awesome :)
+
+Before doing any large undertaking, open a new issue and explain your proposal.
+
+I want to give feedback
+-----------------------
+
+- You think something should be improved (user interface, feature request)
+- Check if your idea is not already proposed
+- Open a new issue
+- Describe your idea
+- You can also up vote with +1 on existing proposals
+
+I want to report a bug
+----------------------
+
+- Check if the issue is not already reported
+- Open a new ticket
+- Explain what is broken
+- Describe how to reproduce the bug
+- Describe your environment (Kanboard version, OS, web server, PHP version, database version, hosting type)
+
+I want to translate Kanboard
+----------------------------
+
+Kanboard is translated in many languages.
+However, translations are not complete, take look at the [translation guide to contribute](http://kanboard.net/documentation/translations).
+
+I want to improve the documentation
+-----------------------------------
+
+- You think something is not clear, there is grammatical errors, typo errors, anything.
+- The documentation is written in Markdown and stored in the folder `docs`.
+- Edit the file and send a pull-request.
+- The documentation on the official website is synchronized with the repository.
+
+I want to contribute to the code
+--------------------------------
+
+Pull-requests are always welcome, however to be accepted you have to follow those directives:
+
+- **Before doing any large change or design proposal, open a new ticket to start a discussion.**
+- If you want to add a new feature, respect the philosophy behind Kanboard. **We focus on simplicity**, we don't want to have a bloated software.
+- The same apply for the user interface, **simplicity and efficiency**.
+- Send only one pull-request per feature or bug fix, your patch will be merged into one single commit in the master branch.
+- Make sure the [unit tests pass](http://kanboard.net/documentation/tests).
+- Respect the [coding standards](http://kanboard.net/documentation/coding-standards).
+- Write maintainable code, avoid code duplication, use PHP good practices.
+
+In any case, if you are not sure about something open a new ticket.
+
+Tell your friends that Kanboard is awesome :)
+---------------------------------------------
+
+If you use Kanboard, spread the word around you.
+Tell them that free and open source software are cool :)