Mattermost (and padlet)

There will be MAttermost again

https://mattermost.uio.no/ifi-undervisning/channels/in5440

feel free to use it as excahgange channel. They also llaunched something called padlet, I applied for getting some login there.

I don't know what it is, so I don't know what it's supposed to work, for instance if it does something else or better than mattermost.

We have to see. If there is no clear distinction between those to channeks, I think it will be best to focus on one.