refactor: split app into modular src architecture

src/components/Field.js

@@ -0,0 +1,12 @@
+import React from 'react';
+import { Text, View } from 'react-native';
+import { styles } from '../styles';
+
+export default function Field({ label, children }) {
+  return (
+    <View style={styles.fieldWrap}>
+      <Text style={styles.label}>{label}</Text>
+      {children}
+    </View>
+  );
+}