add simple example

[swuecho]

no doc available currently

[yellowbean]

I can't even run the sample code from README, is it just me ?

[grantjenks]

pypatt is the old module name. Try importing from patternmatching.

[rix0rrr]

Same here. I'm sure you've done a great job on this library, and I'd love to use it, but there are litteraly NO docs or explanations anywhere except a "todo: write example" and a note that "you probably know exactly how this works from other languages".

It's not very helpful :(