Add React Native app

reactNative/hooks/useColorScheme.ts

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+export { useColorScheme } from 'react-native';

reactNative/hooks/useColorScheme.web.ts

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+// NOTE: The default React Native styling doesn't support server rendering.
+// Server rendered styles should not change between the first render of the HTML
+// and the first render on the client. Typically, web developers will use CSS media queries
+// to render different styles on the client and server, these aren't directly supported in React Native
+// but can be achieved using a styling library like Nativewind.
+export function useColorScheme() {
+  return 'light';
+}

reactNative/hooks/useThemeColor.ts

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+/**
+ * Learn more about light and dark modes:
+ * https://docs.expo.dev/guides/color-schemes/
+ */
+
+import { useColorScheme } from 'react-native';
+
+import { Colors } from '@/constants/Colors';
+
+export function useThemeColor(
+  props: { light?: string; dark?: string },
+  colorName: keyof typeof Colors.light & keyof typeof Colors.dark
+) {
+  const theme = useColorScheme() ?? 'light';
+  const colorFromProps = props[theme];
+
+  if (colorFromProps) {
+    return colorFromProps;
+  } else {
+    return Colors[theme][colorName];
+  }
+}