Add round name information

[LucieContamin]

Per suggestion from @shauntruelove , the tasks.json file has a round_id field that can be a string.
In the scenario complex example repo, the tasks.json has multiple date as round_id.
The dates are used to identify each round in the filename, content of the files, etc. However, we also identify the name by round, for example, round 1 is the date "2020-01-01".

Should we either add a round_name field in the tasks.json file or should we have a specific place in the repo to store that information in a different format? or both?

[annakrystalli]

I'm in favour of this idea and will add it to the current draft. We can finalise the decision at the PR review stage 👍

[annakrystalli]

Closed via #11