Move magic numbers in layout files to @dims

[AndyScherzinger]

Actual behaviour

-many magic numbers in layout like 4dp, see review comments in #5

Expected behaviour

-move magic numbers like 4dp (widely used) to the dims.xml file as a constant

Hi, I am a newbie FOSS Contributor. Can I start by contributing to this project-this bug first? Thanks!

[AndyScherzinger]

Hi @sangeethaKP, absolutely yes! We would be happy about that contribution :)
Any questions, please let me and @tobiasKaminsky know.