FocusTime:2021 017 Expo
017 Register-Your-Account
018 Make-a-Snack
018 What-Is-A-Snack-
019 FocusTime-Demo
https://snack.expo.io/@mobinni/focustime-demo
026 React-Native-View
https://reactnative.dev/docs/view
026 React-Native-StyleSheet
https://reactnative.dev/docs/stylesheet
026 React-Native-Text
https://reactnative.dev/docs/text
027 React-Native-Paper
https://callstack.github.io/react-native-paper/
027 TextInput
https://callstack.github.io/react-native-paper/text-input.html
028 StyleSheet
https://reactnative.dev/docs/stylesheet
028 Text
https://reactnative.dev/docs/text
028 TouchableOpacity
https://reactnative.dev/docs/touchableopacity
030 useState
https://reactnative.dev/docs/intro-react#state
034 useEffect
https://reactjs.org/docs/hooks-effect.html
035 useEffect
https://reactjs.org/docs/hooks-effect.html
035 useRef
https://reactjs.org/docs/hooks-faq.html#is-there-something-like-instance-variables
040 Expo-Keep-Awake
https://docs.expo.io/versions/latest/sdk/keep-awake/
041 Vibration
https://reactnative.dev/docs/vibration
048 FlatList