Add tweet templates about users of Tor

Data on users is already aggregated and made available on the metrics website:

https://metrics.torproject.org/userstats-relay-country.html

It should also be possible to use the graphs as generated by the website in the tweets.

This would not just be a couple of templates but perhaps also include:

• Total directly connecting users
• Total bridge users
• Users (direct/bridge) by:
• country
• transport
• IP version