Added Cards to the home fragment. These will contain more detailed
announcements later on once certain features are added. There a few
drawables for different coloured cards but there currently isn't a way
to change the card background with this library. I might need to extend
the library or find some other option later on but for now those images
are available.

Signed-off-by: Conrad Haupt <conradjhaupt@gmail.com>