Project leads: please add yourself to the README

[brettcannon]

If there's a critical decision to be made I need to know who I should reach out to, so please add your project and team to the README.

Projects that I know are participating and thus I'm calling out to please update the README in whatever way makes sense for you and your project:

• PBS: @indygreg @zanieb @geofft
• BeeWare: @freakboy3742
• Python core: @ned-deily @emmatyping