Event Media

[rosscado]

Add a field media to event entities to hold promotional media like posters.

media:
   poster:

Event Posters

Many of the better promoted events have poster images. These can be highly informative and will be important to display to athletes, but they will be impossible to parse programmatically.
The poster field could be a URL to the online image, or an embedded image document itself. Saving the image within the application would be more resilient but would consume much more data.

Originally posted by @rosscado in #57 (comment)