Ability to add an explicit app to favorites

[claudijd]

From what I can tell in the application, I can only add a monitored app if it's recently been build and in the stream.

I think it would be helpful if I could a specific app to favorites.

Something like an add button on the favorites screen would be more than enough to solve this issue.

Thanks!

[listrophy]

Thanks for the input!

My free time is tied up for the next two weeks, but maybe @Jaym3s can take a swing at it?