Add section for one-off canonical example repos w foundry implementations around common problems

[wminshew]

you could add them to libraries or projects, but imo those have a distinct connotation (maybe that's a mistake on my part, not sure)

ideally they could be sorted or annotated by functionality/uniqueness of foundry implementation, e.g. https://twitter.com/gakonst/status/1510460960607125505?s=20&t=N2lvE2LcD38NzcI6AgEY3w

@gakonst

[crisgarner]

Maybe for this use case makes sense to add it to the tools sections as it's some kind of template.

[crisgarner]

This repo in the example is particular to DappTools, but as Foundry is the heir of dapp, a tutorial or recent version makes sense to list