Document conventions around adding new maintainers
Document conventions around adding new maintainers

Adding them to `maintainers/maintainer-list` in a separate commit.

Co-Authored-By: Pavol Rusnak <ab8bc2c6388fa63c7ac477230cd3c9c8f17be98b@rusnak.io>
Co-Authored-By: Atemu <07f51b3c29c0b614f23d2581629f478d827bc80b@gmail.com>
Co-Authored-By: Kevin Cox <6f08ff9e47c4cdf9b7ec287fa9eac484285b09b8@kevincox.ca>

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