Create README.md

Author: filiptronicek

.expo-shared/README.md

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+> Why do I have a folder named ".expo-shared" in my project?
+
+The ".expo-shared" folder is created when running commands that produce state that is intended to be shared with all developers on the project. For example, "npx expo-optimize".
+
+> What does the "assets.json" file contain?
+
+The "assets.json" file describes the assets that have been optimized through "expo-optimize" and do not need to be processed again.
+
+> Should I commit the ".expo-shared" folder?
+
+Yes, you should share the ".expo-shared" folder with your collaborators.