Align with Upstream K8s and CNCF

[danehans]

The project should follow k8s and CNCF conventions, naming, style, etc. This should be documented and existing content should be updated accordingly. Examples:

Contributing
k8s: https://github.com/k8sgateway/community/blob/main/CONTRIBUTING.md
k8sGateway: https://github.com/k8sgateway/community/blob/main/CONTRIBUTING.md

Readme
k8s: https://github.com/kubernetes/community/blob/master/contributors/guide/README.md
k8sGateway: https://github.com/k8sgateway/community/blob/main/README.md

Membership Roles
k8s: https://github.com/kubernetes/community/blob/master/community-membership.md
k8sGateway: https://github.com/k8sgateway/community/blob/main/ROLES.md

CNCF provides templates that should be used to bootstrap this project.

[ilrudie]

#15 begins chipping away at the Membership/Roles items mentioned above