Update README.md

added links for raw file download

README.md

@@ -1,11 +1,18 @@
 # gdi-ct
-a GirlDevelopIt course on computational thinking
+a GirlDevelopIt course on computational thinking using Python
 
-These materials are provided for a [GirlDevelopIt][1] course to be presented
+The datafile [ice-cream.csv][1] is more convenient to download using "Save As…" from your browser.
+Students who have installed [Jupyter Notebook][2] (also known as IPython Notebook) may find it
+useful to also download the [gdi-tlapip.ipynb][3] file to save a little typing during the course.
+
+These materials are provided for a [GirlDevelopIt][4] course to be presented
 in Philidelpha in April 2016. The core content here resides in the OpenDocument
-Presentation slide show with the data file and source code in support of that.
+Presentation slide show with the data file and source code in support of that presentation.
 
 Since most of the substance of this course will be in the presentation itself, you 
-may not be able to derive much from the assets, but you're welcome to try.
+may not be able to derive much from the slides and code, but you're welcome to try.
 
- [1]: https://www.girldevelopit.com/
+  [1]: https://raw.githubusercontent.com/mwartell/gdi-ct/master/ice-cream.csv
+  [2]: http://jupyter.org/
+  [3]: https://raw.githubusercontent.com/mwartell/gdi-ct/master/gdi-tlapip.ipynb
+  [4]: https://www.girldevelopit.com/