feat: 首页，收藏页的UI，字体 组件封装

lib/common/const/const_color.dart

@@ -9,6 +9,8 @@ class ConstColor {
   static Color btWhite = Color(0xffEEEEEE);
   // #89F011
   static Color btGreen = Color(0xff89F011);
+  // black
+  static Color black = Color(0xff222222);
 
   static Color withValue(String value) {
     String colorValue = value.replaceAll('#', '');

lib/common/const/const_string.dart

@@ -0,0 +1,11 @@
+
+class ConstString {
+
+}
+
+class ConstFont {
+  static const String montBlack = 'Montserrat-Black';
+  static const String montBold = 'Montserrat-Bold';
+  static const String montMedium = 'Montserrat-Medium';
+  static const String montRegular = 'Montserrat-Regular';
+}