Add cheat sheet for meetup/user group organizers

[treyhunner]

• Summarize important user group resource info (from here)
• Note how to get PSF to cover your meetup fees
• Note how to submit grants for workshops also
• Note other important things (but not an overwhelming number of things)
• Note that if X hours per month are spent contributing to community by running meetups and volunteering that you can become a contributing (voting) member (see here)

[oboechick]

I will handle this.