create tutorial_datasource_md

[montemurroPaolo]

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What type of PR is this?

Select all that apply: [ ] -> [x]

• [ ] R
• [ ] CSV
• [x] other

R

I confirm:

• [ ] I checked the data
• [x] I checked the format with the still_to_do function
• [ ] I read the dataset description

CSV

I confirm:

• [ ] I checked the data
• [ ] I read the dataset description

Additional comments

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[eguidotti]

Great! Added here

• https://github.com/covid19datahub/COVID19/wiki/Add-a-new-data-source
• https://github.com/covid19datahub/COVID19/wiki/Create-a-pull-request