Create README.txt

Author: il-Luca

.design/README.txt

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+VectorDrawable does not support all SVG features, such as shadows and masks.
+Therefore the ic_launcher files are slightly different from the master files: no shadows, minor color tweaks, path optimisation.
+Use ic_launcher_*.svg files to generate assets for the app icon
+Use master_*.svg files to generate other assets (e.g. feature graphic, playstore icon) or to rework the icon design