Case Study 360i

Merged Marc Radulescu requested to merge case-study-360i into master

Case study for 360i, and associated blog post.

I've made a folder called case-studies, right now there's no link from the main page to it.

@marin, I was not able to remove the blog template from the case study file. Do you know what I should write in the markdown file so the page looks like the one we have on high availability

cc @sytses @JobV @jacobvosmaer @dzaporozhets