Adding Julio's research topic: the Maxey-Riley Equation

With this issue, I will finish what I started: Uploading information about my topic to the Institute's website.

changed due date to January 20, 2023

changed milestone to %Update-Jan2023

added cm-content label

created merge request !194 (closed) to address this issue

mentioned in merge request !194 (closed)

created merge request !195 (merged) to address this issue

mentioned in merge request !195 (merged)

closed with merge request !195 (merged)

mentioned in commit 7225a97e