[template] Should say something about how to become an invited expert

[jyasskin]

@rhiaro's https://rhiaro.co.uk/2023/09/social-web points out that it can be hard for a non-member expert to know whether they're welcome to participate in a working group. Their article is about a potential Social Web WG, but I think its recommendation would be good to apply to WG charters in general. In particular, charters should include "A set of criteria which Invited Experts should meet" and "A clear process for individuals to self-nominate as IEs." The set of criteria should help folks realize that they're wanted even if they don't work for a W3C member.

[svgeesus]

I agree it is hard to know how to get involved, for interested members of the public.

I guess there are three aspects to becoming an IE:

1. Expert. Has the knowledge required to understand and usefully contribute to the topic
2. Invited. The chair(s) and staff contact(s) are aware of their work and want to invite them
3. Involved. Expertise is not sufficient; being involved in GitHub discussions, pull requests etc and a history of positive involvement is the biggest factor influencing point 2.

Which from the outside, sounds like a catch-22 because many people are unaware that they can become involved without being an invited expert.

So the primary advice needs to be "get involved". People who productively contribute, who help in discussions, who send in PR to fix spec errors, and who do so over a span of time greater than a month or so, are much more likely to be considered. But even if they aren't, if the goal is involvement, that is open to all.