Welcome to Slack!
This is a welcome message. It is formatted using mrkdwn, which is like Markdown but not.
You can references users and channels and they should be linkified: #testing-things
You can read the <https://github.com/cncf/foundation/blob/master/code-of-conduct.md|Code of Conduct>. That wasn't very markdown but oh well.
Obviously, this is placeholder text.