Add Jupyter notebook introducing serialization (in Python)

Author: GraemeWatt

README.md

@@ -1,2 +1,11 @@
 # IPPPComputingLunchClub
 Material presented at IPPP Computing Lunch Club
+
+## [notebooks](notebooks)
+
+[![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/GraemeWatt/IPPPComputingLunchClub/master?filepath=notebooks)
+
+### [serialization.ipynb](notebooks/serialization.ipynb)
+
+This Jupyter notebook introduces serialization (in Python) using the CSV, XML, JSON, Pickle, and YAML formats.
+It was presented on 25th June 2018.