wip basics for bloc based state management

lib/state/app/application/gradeAverages/grade_averages_state.dart

@@ -0,0 +1,19 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'grade_averages_state.freezed.dart';
+part 'grade_averages_state.g.dart';
+
+@freezed
+class GradeAveragesState with _$GradeAveragesState {
+  const factory GradeAveragesState({
+      required GradingSchemes gradingScheme,
+      required List<int> grades,
+  }) = _GradeAveragesState;
+
+  factory GradeAveragesState.fromJson(Map<String, dynamic> json) => _$GradeAveragesStateFromJson(json);
+}
+
+enum GradingSchemes {
+  middleSchool,
+  highSchool,
+}