Frontend first draft

frontend/pshared/lib/provider/resource.dart

@@ -0,0 +1,15 @@
+class Resource<T> {
+  final T? data;
+  final bool isLoading;
+  final Exception? error;
+
+  Resource({this.data, this.isLoading = false, this.error});
+
+  Resource<T> copyWith({T? data, bool? isLoading, Exception? error}) {
+    return Resource<T>(
+      data: data ?? this.data,
+      isLoading: isLoading ?? this.isLoading,
+      error: error ?? this.error,
+    );
+  }
+}