README includes directory name

Author: opotowsky

README.md

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+# snippets
+Scripts, settings and environment options for better research and analysis
+
+## tri_heatmap: Heatmaps in matplotlib
+This notebook gives some guidance on plotting 2D heatmaps in matplotlib given
+the existence of X, Y, Z experimental data.  This uses triangulation to form a
+triangular grid and then applies tricontourf (or tripcolor) to get the surface
+plot with a colorbar.