Create overview of workshops in workshops.md

[svenvanderburg]

This adds a file workshops.md that keeps track of all workshops taught using this lesson material. It would serve to measure the impact of the lesson. I am pretty sure that I miss a lot of past editions, so please update the table!

[github-actions]

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[fnattino]

Thanks @svenvanderburg ! I have added a couple more workshops, @rbavery could you please also add to the list the other workshops that you have taught using the material?

[svenvanderburg]

Thanks @fnattino :)

[svenvanderburg]

@fnattino any update on this? :)

[svenvanderburg]

@fnattino can we merge this?

[fnattino]

Hi @svenvanderburg sorry for blocking this for so long. I have added the workshops I am aware of for which the lesson material has been used. I believe this can be merged after these are included.

[svenvanderburg]

Great @fnattino I committed your suggestions. I think you can go ahead and merge :)