Create a `mice` cheat sheet

[hanneoberman]

Is your feature request related to a problem? Please describe. No, just for ease of use.

Describe the solution you'd like A cheat sheet cf. https://posit.co/resources/cheatsheets/, see https://github.com/rstudio/cheatsheets for templates.

Describe alternatives you've considered NA

Additional context I'll pick this up over the summer for both mice and ggmice.