new logo and resized background

Signed-off-by: Olle Pettersson <olle.e.pettersson@gmail.com>
Merge branch 'develop' of https://github.com/mlromramse/AndroidGradleSample into feature/new-icons-and-background
Merge pull request #1 from mlromramse/feature/new-icons-and-background

New icons and background