add expo app

apps/mobile/app/(tabs)/_layout.tsx

@@ -0,0 +1,56 @@
+import FontAwesome from '@expo/vector-icons/FontAwesome';
+import { Link, Tabs } from 'expo-router';
+import { Pressable, useColorScheme } from 'react-native';
+
+import Colors from '../../constants/Colors';
+
+/**
+ * You can explore the built-in icon families and icons on the web at https://icons.expo.fyi/
+ */
+function TabBarIcon(props: {
+  name: React.ComponentProps<typeof FontAwesome>['name'];
+  color: string;
+}) {
+  return <FontAwesome size={28} style={{ marginBottom: -3 }} {...props} />;
+}
+
+export default function TabLayout() {
+  const colorScheme = useColorScheme();
+
+  return (
+    <Tabs
+      screenOptions={{
+        tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
+      }}
+    >
+      <Tabs.Screen
+        name="index"
+        options={{
+          title: 'Tab One',
+          tabBarIcon: ({ color }) => <TabBarIcon name="code" color={color} />,
+          headerRight: () => (
+            <Link href="/modal" asChild>
+              <Pressable>
+                {({ pressed }) => (
+                  <FontAwesome
+                    name="info-circle"
+                    size={25}
+                    color={Colors[colorScheme ?? 'light'].text}
+                    style={{ marginRight: 15, opacity: pressed ? 0.5 : 1 }}
+                  />
+                )}
+              </Pressable>
+            </Link>
+          ),
+        }}
+      />
+      <Tabs.Screen
+        name="two"
+        options={{
+          title: 'Tab Two',
+          tabBarIcon: ({ color }) => <TabBarIcon name="code" color={color} />,
+        }}
+      />
+    </Tabs>
+  );
+}