Add a simple readme on how to generate/view slides.

Author: prabhuramachandran

slides/README.md

@@ -0,0 +1,13 @@
+The slides are in markdown files in this directory.
+
+Install jupytext https://jupytext.readthedocs.io/) and RISE
+(https://rise.readthedocs.io/) to view the slides.
+
+Once those are installed, you can open up the markdown files just as you would
+a jupyter notebook.  You may also convert the markdown to proper notebook files using
+
+```
+jupytext --to ipynb 01_intro.md
+```
+
+This will generate a `01_intro.ipynb` file.