Prerequisites - To configure add-ins an add-in will need to be created and assigned to a chat room in the active directory. The required commands to do this can be found here: New persistent chat addin, Set Persistent chat addin.
Enabling add-ins in the management tool will regquire rewrite rules to be added. The left column requires a regular experession and the right column will require a URL template.
The configured add-in will now display under the message input in the chat rooms that have the add-ins configured. The add-ins can be interacted with and can be resized by hovering and clicking above the addin and adjusting the size as neccessary.