Displaying Text at the Top of the Issues page

I don’t want random discussion of possible bugs on Github Issues for my project.

I would like to the ability put some text (with markdown ability at the top of the page saying:

"Please don’t post support requests or reports of possible bugs here. The support for this project is provided by the mailing list which is xyzzy on the groups.io system. The issues part of this project is used by the developers to discuss potential solutions to issues that have been identified on the mailing list.