added transaction snackbar message

lib/pages/transactions/transactions_page.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:krezus/domains/transaction/transaction_bloc.dart';
 import 'package:krezus/pages/transactions/widgets/transactions_actions.dart';
 import 'package:krezus/pages/transactions/widgets/transactions_header.dart';
 import 'package:krezus/pages/transactions/widgets/transactions_list.dart';
@@ -9,20 +11,34 @@ class TransactionsPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     MediaQueryData mediaQuery = MediaQuery.of(context);
-    return Center(
-      child: Container(
-        constraints: const BoxConstraints(
-          maxWidth: 1000 
+    return BlocListener<TransactionBloc, TransactionState>(
+      listenWhen: (previous, current) => previous.showSnackBar != current.showSnackBar,
+      listener: (context, state) {
+        if (state.showSnackBar) {
+          ScaffoldMessenger
+          .of(context)
+          .showSnackBar(
+            SnackBar(
+              backgroundColor: state.snackBarIsError ? Colors.red : Colors.green,
+              content: Text(state.snackBarMessage),
+            ),
+          );
+          context.read<TransactionBloc>().add(const TransactionResetSnackBar());
+        }
+      },
+      child: Center(
+        child: Container(
+          constraints: const BoxConstraints(maxWidth: 1000),
+          padding: mediaQuery.padding,
+          child: const Column(
+            children: [
+              TransactionsActions(),
+              TransactionsHeader(),
+              TransactionsList(),
+            ],
+          ),
         ),
-        padding: mediaQuery.padding,
-        child: const Column(
-          children: [
-            TransactionsActions(),
-            TransactionsHeader(),
-            TransactionsList(),
-          ],
-        ),
-      )
+      ),
     );
   }
-}
+}