Add Apiary CLI post

https://trello.com/c/5KTh3sTi/2171-apiary-cli-blog-post

This post is on the Apiary CLI tool. I went with a pretty simple post just describing its functionality and how it can be used to fit in local workflows. Feel free to give different direction if it would be best.

Also, I've set the publish date to tomorrow (November 5th) to give a day for editing and comments.

/cc @neha3091 
documenation > documentation