Write something placeholder

[shiqimei]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

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[shiqimei]

When create a new board, there's some placeholders to guide users to start writing.

[shiqimei]

closes via f23f54e86b202443bab453e31db1430051c74a63