Added documentation on how to contribute new graphs #534
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I am currently having a look at PyGal to see if and how a circle packing visualization (see for example, https://dataforvisualization.com/charts/circle-packing/) can be added to it.
While looking at the sources, I realized that the contribution guidelines do not document how to add new graphs to PyGal. Perhaps, it is considered straight forward, but since it took me some time to figure out how to do it, I share my notes with an example back to the guide.
Please let me know in case you prefer the contents to be in another file or section of the documentation.