mention license and authors

content/community.rst

-Getting in touch with the Kwant community
-=========================================
+The Kwant community
+===================
+
+The Kwant project is an international collaboration.  Everybody is welcome to
+participate in the community by asking and replying to questions, reporting
+bugs, providing suggestions, and `contributing to the code and documentation
+</contribute.html>`_.
+
+A list of `Kwant authors </authors>`_ is included in the documentation.
+Please only contact the authors directly for matters that cannot be discussed
+in public on one of the mailing lists.
+
 
 General mailing list
 --------------------

content/install.rst

 ================================
-Downloading and installing Kwant
+Installing Kwant
 ================================
 
-Overview of available methods
-=============================
+License and citation request
+============================
+
+Kwant is free software covered by the `2-clause BSD license </license>`_.
+
+If you have used Kwant for work that has lead to a scientific publication,
+please `cite the Kwant paper and possibly other relevant publications
+</cite>`_.
+
+
+Overview of available installation methods
+==========================================
 
 The quickest and easiest way to install Kwant is using the prepared packages
 that are available for GNU/Linux (`Debian <#debian-and-derivatives>`_, `Ubuntu