add license and readme, extend gitignore

.gitignore

 *~
 .ipynb_checkpoints
 site
-
+docs
+*.pyc
+__pycache__

LICENSE.md

+Copyright TU Delft 2016-2018.
+
+Contents are available under CC-BY-SA-NC 4.0.
+
+Source code is available under BSD license.
+

README.md

+# Solid state lectures
+
+Lecture notes and teaching material used for the Delft University of Technology course Solid State Physics (Vaste Stof Fysica, TN2844).
+
+The compiled materials are available at http://solidstate.quantumtinkerer.tudelft.nl
+