Setting up the theme (#1290)

packages/uni_ui/lib/theme.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+
+const Color darkGray = Color.fromARGB(255, 48, 48, 48);
+const Color mildWhite = Color.fromARGB(255, 255, 245, 243);
+const Color darkRed = Color.fromARGB(255, 102, 9, 16);
+const Color dust = Color.fromARGB(255, 228, 199, 184);
+const Color pureWhite = Color.fromARGB(255, 255, 255, 255);
+const Color pureBlack = Color.fromARGB(255, 0, 0, 0);
+const Color normalGray = Color.fromARGB(255, 127, 127, 127);
+const Color lightGray = Color.fromARGB(255, 229, 229, 229);
+const Color salmon = Color.fromARGB(255, 227, 145, 145);
+
+const _textTheme = TextTheme(
+  displayLarge: TextStyle(fontSize: 40, fontWeight: FontWeight.w400),
+  displayMedium: TextStyle(fontSize: 32, fontWeight: FontWeight.w400),
+  displaySmall: TextStyle(fontSize: 28, fontWeight: FontWeight.w400),
+  headlineMedium: TextStyle(fontSize: 24, fontWeight: FontWeight.w300),
+  headlineSmall: TextStyle(fontSize: 20, fontWeight: FontWeight.w400),
+  titleLarge: TextStyle(fontSize: 18, fontWeight: FontWeight.w300),
+  titleMedium: TextStyle(fontSize: 17, fontWeight: FontWeight.w300),
+  titleSmall: TextStyle(fontSize: 16, fontWeight: FontWeight.w300),
+  bodyLarge: TextStyle(fontSize: 16, fontWeight: FontWeight.w400),
+  bodyMedium: TextStyle(fontSize: 14, fontWeight: FontWeight.w400),
+  bodySmall: TextStyle(fontSize: 13, fontWeight: FontWeight.w400),
+);
+
+ThemeData lightTheme = ThemeData(
+    useMaterial3: true,
+    textTheme: _textTheme,
+    colorScheme: ColorScheme.fromSeed(
+        seedColor: darkRed,
+        surface: mildWhite,
+        surfaceContainer: mildWhite,
+        primary: darkRed,
+        onPrimary: pureWhite,
+        secondary: dust,
+        onSecondary: pureWhite,
+        tertiary: salmon,
+        onTertiary: pureWhite
+    ),
+    primaryColor: darkRed,
+    cardTheme: CardTheme(
+        margin: EdgeInsets.all(4),
+        color: mildWhite,
+
+    ),
+    dividerColor: lightGray,
+    hintColor: lightGray,
+    indicatorColor: darkRed,
+    iconTheme: const IconThemeData(color: darkRed),
+)