部屋ごとにメッセージみれる
Add post view
post view navigation viewに埋め込んだ
Add cancel button and done button and text view
Add outlet and action
(仮)done, cancel
Add compose button to message view right bar top, open post view as a modal when clicked
set post view controller's adjust inset off
Add post:toRoom:completeHandler: method
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Rooms ViewからSettingみれるよにした