Update readme.md: first draft

meetings/2019/2019-05-28-data-visualisation/readme.md

+## Python Cinema #1
+### [Jake VanderPlas - How to Think about Data Visualization - PyCon 2019](https://www.youtube.com/watch?v=vTingdk_pVM)
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+<br/><br/><br/><br/> 
+Some of the Python open source libraries we discussed:
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+- **HoloViews :** Declarative objects for instantly visualizable data, building Bokeh plots from convenient high-level specifications. (http://holoviews.org/)
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+- **Bokeh :** Interactive plotting in web browsers, running JavaScript but controlled by Python. (https://bokeh.pydata.org/en/latest/)
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