Automatically pin first message in project forum

[Alathreon]

Is your feature request related to a problem? Please describe.

The initial message of a project is where many things are specified like links.
But users will start to discuss and the initial message will be lost.

Describe the solution you'd like

The first message should be automatically pinned by TJ-Bot.

Describe alternatives you've considered

Manually pinning it, but it's annoying and require some right.

Additional context