Add entry for HF Slack in communications.md
We have officially settled on Slack as our informal, asynchronous and unofficial chat application. There are new points of difference decided on a recent call between myself, Michael, and Tom:
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Anyone is allowed in. We'll have to determine a moderation policy as a result, but we feel an open forum is better in this case.
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We will announce this officially, and provide an open invite link, which will be posted on social media and be given its own entry on the HF website.
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The existing rules written in
communications.md
are already sound with respect these changes, and need only a small update with the relevant info.