Frontend first draft

frontend/pshared/lib/widgets/template.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+import 'package:provider/provider.dart';
+
+import 'package:pshared/provider/template.dart';
+
+
+class ResourceContainer<T extends GenericProvider> extends StatelessWidget {
+  final Widget Function(BuildContext context, T provider) builder;
+  final Widget? loading;
+  final Widget? error;
+  final Widget? empty;
+
+  const ResourceContainer({
+    required this.builder,
+    this.loading,
+    this.error,
+    this.empty,
+  });
+
+  @override
+  Widget build(BuildContext context) => Consumer<T>(builder: (context, provider, _) {
+    if (provider.isLoading) return loading ?? Center(child: CircularProgressIndicator());
+    if (provider.error != null) return error ?? Text('Error while loading data. Try again'); //TODO: need to implement localizations and add more details to the error
+    if (provider.isEmpty) return empty ?? Text('Empty data'); //TODO: need to implement localizations too
+    return builder(context, provider);
+  });
+}