Implement Design Formatting of Bot Messages

[edenworky]

https://api.slack.com/docs/attachments

This is the contribution message:

[{"fallback": "Required plain-text summary of the attachment.", "color": " New Project: allow to customize - send bot announcement with download link or not / to which channel / content messagede86", "pretext": "", "authorname": "Contribution Title","authorlink": "http://flickr.com/bobby/","authoricon": "http://flickr.com/icons/bobby.jpg", "text": "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer auctor ornare nisl quis sodales. Quisque scelerisque velit sed leo porttitor dignissim.", "imageurl": "http://my-website.com/path/to/image.jpg","thumb_url": "http://example.com/path/to/thumb.png"}]

For milestones use the message "new milestone submitted:" and the same message attachment above

Bot Messages
[ ] On New Project
[ ] On new contribution (including the hardcoded string “New contribution submitted” followed by the contribution title in bold, the contribution description, and the list of contributors)
[ ] On new milestone (same as new contribution but with the hardcoded string “New milestone submitted”)