INFRA: Set Up Project.

lib/themes/styles.dart

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+import 'package:flutter/material.dart';
+import 'app_them_data.dart';
+
+class Styles {
+  static ThemeData themeData(bool isDarkTheme, BuildContext context) {
+    return ThemeData(
+      scaffoldBackgroundColor: isDarkTheme ? AppThemeData.surfaceDark : AppThemeData.surface,
+      primaryColor: isDarkTheme ? AppThemeData.dangerDark300 : AppThemeData.danger300,
+      brightness: isDarkTheme ? Brightness.dark : Brightness.light,
+      appBarTheme: AppBarTheme(
+        backgroundColor: isDarkTheme ? AppThemeData.grey900 : AppThemeData.grey50,
+      ),
+      timePickerTheme: TimePickerThemeData(
+        backgroundColor: isDarkTheme ? AppThemeData.greyDark100 : AppThemeData.grey100,
+        dialTextStyle: TextStyle(fontWeight: FontWeight.bold, color: isDarkTheme ? AppThemeData.greyDark100 : AppThemeData.grey100),
+        dialTextColor: isDarkTheme ? AppThemeData.greyDark50 : AppThemeData.grey50,
+        hourMinuteTextColor: isDarkTheme ? AppThemeData.greyDark100 : AppThemeData.grey100,
+        dayPeriodTextColor: isDarkTheme ? AppThemeData.greyDark100 : AppThemeData.grey100,
+      ),
+    );
+  }
+}