add a nice README

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+This repository contains the seminar paper "Chatty Things" by Roland Hieber.
+The following files are relevant:
+
+* outline.tex: LaTeX source of the outline.
+  This outline is mostly kept for historical reasons.
+
+* main.tex: LaTeX source of the main paper.
+  This paper is licensed under the Creative Commons Attribution-NoDerivs 3.0
+  Unported license (see https://creativecommons.org/licenses/by-nd/3.0/). You
+  may share it as long as you give proper attribution to me.
+
+* presentation.tex: LaTeX source of the presentation slides.
+  The slides are licensed under the Creative Commons Attribution-ShareAlike 3.0
+  Unported license (see https://creativecommons.org/licenses/by-sa/3.0/). You
+  may share it as long as you give proper attribution to me, and adapt, remix or
+  build onto it as long as your resulting work has the same license.
+
+Both documents use figures drawn with PGF/TikZ, which rely on public domain
+icons from the Tango Desktop Project.