Add possibility to put a message on past builds

Description of the feature request

When your build failed or succeed we can add a message on it and you can see this message on the dashboard.
May be some builds failed for reasons and some developers and maintainer can understood with some facility why this build failed or pass (like aborted build.)

Use case / for what or how I would use it

Like a user, i can select one passed build and write a comment (like twitter ~140 characters)
This message is marked on build and we can see quickly the comment.

Only the writer can update this message as well an administrateur.

Thanks for the #feature-request @Fristok!