Merge pull request #704 from github/add-hackathon-topic

Add hackathon topic

Author: brandonrosage

topics/hackathon/index.md

@@ -0,0 +1,9 @@
+---
+topic: hackathon
+aliases: hackfest, codefest, hackday
+display_name: Hackathon
+related: game-jam, hacktoberfest, game-off
+short_description: A hackathon is a gathering where developers collaboratively code in an extreme manner over a short period of time.
+wikipedia_url: https://en.wikipedia.org/wiki/Hackathon
+---
+A hackathon is a sprint-like event in which people collaborate intensively on software projects. The goal of a hackathon is to create usable software or hardware with the goal of creating a functioning product by the end of the event.