Make a cheat sheet

[inglesp]

In his suggestions for improving the ehrQL docs (opensafely/documentation#1592), @JaidipGill suggested a cheat sheet:

An ehrQL cheat sheet could provide users a quick view of the most common syntax rather than having to read long, text-heavy tutorials/references.

ehrQL is much simpler than Pandas, so an ehrQL cheat sheet should be much simpler than the Pandas cheat sheet that Jaidip linked to.

I'm not sure exactly what form this should take. Whoever takes this one should produce one or more scrappy drafts for early feedback before investing significant effort.

[inglesp]

Tom's going to draft a first version.

[madwort]

first scrappy draft with two different layouts (more or less boiler plate...) - with fewer titles it nearly fits on one page

ehrQL cheatsheet.md

ehrQL cheatsheet fewer titles.md

[madwort]

with colours

[madwort]

#2239

[madwort]

Initial version merged, would be good to do some more layout work on it