Update readme with figures

README.md

@@ -1,3 +1,26 @@
 # MPL-Colormaps-Mathematica
 
-Mathematica port of matplotlib colormaps Magma, Inferno, Plasma, Viridis, and Cividis
+Mathematica port of matplotlib colormaps Magma, Inferno, Plasma, Viridis, and Cividis.
+
+![alt text](examples/gallery.png "Gallery of color maps 'Magma', 'Inferno', 'Plasma', 'Viridis', and 'Cividis'")
+
+## Usage
+
+To import this package, either download `MPLColorMap.m` and import the file using
+```
+<< "path/to/MPLColorMap.m";
+```
+or import the file from this web server using
+```
+<< "https://git.mieling.net/Thomas/MPL-Colormaps-Mathematica/raw/\
+branch/master/MPLColorMap.m";
+```
+
+The various color maps are then available as `MPLColorMap["Viridis"]` etc.
+For example
+```
+DensityPlot[Sin[x] Sin[y], {x, 0, 2 \[Pi]}, {y, 0, 2 \[Pi]}, 
+ ColorFunction -> MPLColorMap["Viridis"]]
+```
+produces the following image:
+![alt text](examples/densityplot.png "Density plot of sin(x) sin(y) using the 'Viridis' color map")