[FEATURE REQUEST] Add CodeJam event

[MetaNovitia]

Motivation

Why are you requesting this feature? Is it related to a problem?

CodeJam registrations open on March 3, 11AM PST. Ends April 4, 7PM PST.
Qualifiers on April 3, 4PM PST. Ends April 4, 7PM PST.
https://codingcompetitions.withgoogle.com/codejam/schedule

Proposed Change

What are you proposing?

Add event to Events page, Home page, and announcements on Puzzle page.

[btjanaka]

If this is difficult, there should probably be a way to make it easier :p