eng(supabase): add example file

packages/brick_supabase/example/example.dart

@@ -0,0 +1,76 @@
+import 'package:brick_core/core.dart';
+import 'package:brick_supabase/brick_supabase.dart';
+import 'package:supabase/supabase.dart';
+
+/// This class and code is always generated.
+/// It is included here as an illustration.
+/// Supabase adapters are generated by domains that utilize the brick_supabase_generators package,
+/// such as brick_offline_first_with_supabase_build
+class UserAdapter extends SupabaseAdapter<User> {
+  @override
+  Future<User> fromSupabase(data, {required provider, repository}) async {
+    return User(
+      name: data['name'],
+    );
+  }
+
+  @override
+  Future<Map<String, dynamic>> toSupabase(instance, {required provider, repository}) async {
+    return {
+      'name': instance.name,
+    };
+  }
+
+  @override
+  final defaultToNull = false;
+
+  @override
+  final fieldsToSupabaseColumns = {
+    'name': RuntimeSupabaseColumnDefinition(columnName: 'name'),
+  };
+
+  @override
+  final ignoreDuplicates = false;
+
+  @override
+  final onConflict = null;
+
+  @override
+  final tableName = 'users';
+
+  @override
+  final uniqueFields = {};
+}
+
+/// This value is always generated.
+/// It is included here as an illustration.
+/// Import it from `lib/brick/brick.g.dart` in your application.
+final dictionary = SupabaseModelDictionary({
+  User: UserAdapter(),
+});
+
+/// A model is unique to the end implementation (e.g. a Flutter app)
+class User extends SupabaseModel {
+  final String name;
+
+  User({
+    required this.name,
+  });
+}
+
+class MyRepository extends SingleProviderRepository<SupabaseModel> {
+  MyRepository(String apiUrl, String apiKey)
+      : super(
+          SupabaseProvider(
+            SupabaseClient(apiUrl, apiKey),
+            modelDictionary: dictionary,
+          ),
+        );
+}
+
+void main() async {
+  final repository = MyRepository('http://localhost:8080', 'YOUR_API_KEY_HERE');
+
+  final users = await repository.get<User>();
+  print(users);
+}