implemented mock crypto repository

changed Cupertino search bar to Material UI 3
changed baseline color and card colors
implemented fetching crypto data from public API (untested)

lib/presentation/settings_page/settings_page.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+import '../common/svg_objects.dart';
+import '../locale_bloc/locale_bloc.dart';
+import '../locale_bloc/locale_events.dart';
+import '../locale_bloc/locale_state.dart';
+
+class SettingsPage extends StatelessWidget {
+  const SettingsPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Settings')),
+      body: Center(
+        child: GestureDetector(
+          onTap: () => context.read<LocaleBloc>().add(const ChangeLocaleEvent()),
+          child: SizedBox.square(
+            dimension: 50,
+            child: Padding(
+              padding: const EdgeInsets.only(right: 12),
+              child: BlocBuilder<LocaleBloc, LocaleState>(
+                  builder: (context, state) {
+                    return state.currentLocale.languageCode == 'ru'
+                        ? const SvgRu()
+                        : const SvgUs();
+                  }),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}