[iOS] Implement staffs base · DroidKaigi/conference-app-2023@c69270f

Header comments should be consistent with project patterns (file_header)

Lines should not have trailing whitespace (trailing_whitespace)

Lines should not have trailing whitespace (trailing_whitespace)

Lines should not have trailing whitespace (trailing_whitespace)

Lines should not have trailing whitespace (trailing_whitespace)

TODOs should be resolved (Open map) (todo)

TODOs should be resolved (Find good render way) (todo)

Lines should not have trailing whitespace (trailing_whitespace)

Lines should not have trailing whitespace (trailing_whitespace)

Lines should not have trailing whitespace (trailing_whitespace)

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