fill in directories for experts.toml file about compiler-team

[mark-i-m]

@spastorino Yep, that's correct. That's all I have for now :)

[spastorino]

Added grammar #95 but we need to engage more people to fill this. Also, at some point we talked about adding a not-quite-experts level, don't remember if that was decided or was just discussed. /cc @davidtwco

[spastorino]

Have also done #130 and removed myself from this issue. I'd just try to go to an auto sign up kind of process where each person that works on the compiler can add themselves to wherever they feel they should be and meanwhile they are at it fill the directories in :).

[spastorino]

Done the auto sign up call https://internals.rust-lang.org/t/call-to-fill-compiler-experts-familiar-map/10630

[DHorse2]

Re the not-quite expert group. Any domain has highly relevant stakeholders with other skill sets.

For example this project has close ties to the idea as demonstrated in various comments.

[mark-i-m]

@spastorino I'll be missing for a couple of weeks, but I don't mind being added for the macro_rules implementation in https://github.com/rust-lang/rust/tree/master/src/libsyntax/ext/tt

[spastorino]

@mark-i-m cool, can you please provide a PR?

[spastorino]

@mark-i-m if I remember correctly you've already provided the PR, right?. Is there something else you want to add in the experts map?.