basic stracture and auth

in memory db :)

apps/mobile/src/app/(tabs)/attendance.tsx

@@ -0,0 +1,28 @@
+import { View, Text, StyleSheet } from 'react-native'
+
+export default function AttendanceScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Attendance</Text>
+      <Text style={styles.subtitle}>Track your gym visits</Text>
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: 'center',
+    alignItems: 'center',
+    backgroundColor: '#f5f5f5',
+  },
+  title: {
+    fontSize: 24,
+    fontWeight: 'bold',
+    marginBottom: 8,
+  },
+  subtitle: {
+    fontSize: 16,
+    color: '#666',
+  },
+})