Add longer description and links to materials

README.md

@@ -1,5 +1,15 @@
 # python-splash-lesson
-Class materials for "Intro Programming in Python" Splash classes
+Class materials for "Intro Programming in Python" Splash classes.
+
+A two-hour, introductory programming course, for beginners in high school or middle school, using the Python programming language.
+
+Taught at various [MIT ESP Splash programs and Spark programs](https://esp.mit.edu/learn/index.html).
+
+Most recently taught at [MIT ESP Spark 2016](https://esp.mit.edu/learn/Spark/2016/catalog#class_10481).
+
+[[Presentation slides]](./python-2016-03-spark/lesson.beamer.pdf) [[Class handout]](./python-2016-03-spark/lesson.article.pdf)
+
+<br style="clear: both;" />
 
 <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">Intro Programming in Python</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="https://github.com/jmoldow/python-splash-lesson" property="cc:attributionName" rel="cc:attributionURL">Jordan Moldow</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.<br />Permissions beyond the scope of this license may be available at <a xmlns:cc="http://creativecommons.org/ns#" href="http://creativecommons.org/compatiblelicenses" rel="cc:morePermissions">http://creativecommons.org/compatiblelicenses</a>.