Put it in the Tutorials and Solutions section. The format can take whatever works best for you. You can browse through some of the existing tutorials for inspiration if you need it.
I tend to make my tutorials pretty formal (see the Design Pattern postings). Others can be quite informal. One person wrote their tutorial as a story (A State Machine Primer with HABlladin, the openHAB Genie) which I love!
Do what works best for you.
Thanks!