Merge branch '55-improve-app-metadata-include-fdroid-metadata-in-repository' into 'master'

Resolve "Improve app metadata, include fdroid metadata in repository"

Closes #55

See merge request android/wordguessing!58

icons/featureGraphic.svg

+<?xml version="1.0" encoding="UTF-8"?>
+<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 1024 500" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="1024" height="500" rx="0" ry="0" fill="#977cff"/></svg>