describe 2020-07-08 design meeting on the "path to lang-team membership"

[nikomatsakis]

cc @rust-lang/lang -- does this seem like a good description?

[rust-highfive]

@nikomatsakis: no appropriate reviewer found, use r? to override

[Mark-Simulacrum]

This looks great, though I can't comment on it being an accurate summary, having not attended the meeting. I think having some idea of a path to membership is really meaningful though.

[XAMPPRocky]

Looks good to me! The idea of having trusted non-members as liaisons is really interesting and could be a good way to build more of a community and more shared knowledge around features.