Compose an Article

[denkeni]

• Design: https://zpl.io/2Z1yjMw
• API: POST /api/board/{bid}/article https://api.devptt.dev:5000/#/article/post_api_board__bid__article

You may implement the UI with either layoutSubviews, Auto Layout in code, or Texture.
You may implement the navigation flow with existing coordinator pattern or traditional iOS navigation.

Further development: Edit an article