Add Section Component prop type (#277)

The React 18 update eliminates children from the React.FC default type. Apply the resulting changes

Author: seventeeen

Diff for: template/App.tsx

@@ -28,6 +28,7 @@ import {
 } from 'react-native/Libraries/NewAppScreen';
 
 const Section: React.FC<{
+  children: React.ReactNode;
   title: string;
 }> = ({children, title}) => {
   const isDarkMode = useColorScheme() === 'dark';