Covid_19: Add world data (e.g. italy, south-corea) in same format for comparison

[netzwerg]

When visualizing data, it would be great to be able to compare CH-data with trajectories of other countries, most notably Italy and South-Corea.

Specifically, we'd like to develop "small multiples", displaying each CH-canton.

Visualization could be along the lines of this FT viz, thus we need world data to provide the lines in the grey backdrop:

[zdavatz]

@netzwerg where do you have the South Korea Data from?

[netzwerg]

@zdavatz I don't know yet, that needs to be investigated. Some data seems to be available, e.g. on Wikipedia.

[zdavatz]

try here: https://github.com/CSSEGISandData/COVID-19/

[jb3-2]

South Korean data can be found here:

https://github.com/CSSEGISandData/COVID-19/blob/master/who_covid_19_situation_reports/who_covid_19_sit_rep_time_series/who_covid_19_sit_rep_time_series.csv

[Eisit]

I opened (and closed, see comments as for why) a similar ticket for neighbouring countries: https://github.com/openZH/covid_19/issues/77

You can note the links listed there.

[netzwerg]

Closing this in favor of: https://renkulab.io/projects/covid-19/covid-19-public-data