Added login screen and Tree page screen to test graph view package

lib/pages/home/bloc/home_bloc.dart

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+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:graphview/GraphView.dart';
+import 'package:syncrow_web/pages/home/bloc/home_event.dart';
+import 'package:syncrow_web/pages/home/bloc/home_state.dart';
+
+class HomeBloc extends Bloc<HomeEvent, HomeState> {
+  final Graph graph = Graph()..isTree = true;
+  final BuchheimWalkerConfiguration builder = BuchheimWalkerConfiguration();
+  List<Node> sourcesList = [];
+  List<Node> destinationsList = [];
+
+  HomeBloc() : super((HomeInitial())) {
+    on<CreateNewNode>(_createNode);
+  }
+
+  void _createNode(CreateNewNode event, Emitter<HomeState> emit) async {
+    emit(HomeInitial());
+    sourcesList.add(event.sourceNode);
+    destinationsList.add(event.destinationNode);
+
+    for (int i = 0; i < sourcesList.length; i++) {
+      graph.addEdge(sourcesList[i], destinationsList[i]);
+    }
+
+    builder
+      ..siblingSeparation = (100)
+      ..levelSeparation = (150)
+      ..subtreeSeparation = (150)
+      ..orientation = (BuchheimWalkerConfiguration.ORIENTATION_TOP_BOTTOM);
+
+    emit(HomeUpdateTree(graph: graph, builder: builder));
+  }
+}

lib/pages/home/bloc/home_event.dart

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+import 'package:equatable/equatable.dart';
+import 'package:graphview/GraphView.dart';
+
+abstract class HomeEvent extends Equatable {
+  const HomeEvent();
+
+  @override
+  List<Object> get props => [];
+}
+
+class CreateNewNode extends HomeEvent {
+  final Node sourceNode;
+  final Node destinationNode;
+  const CreateNewNode(
+      {required this.sourceNode, required this.destinationNode});
+
+  @override
+  List<Object> get props => [sourceNode, destinationNode];
+}

lib/pages/home/bloc/home_state.dart

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+import 'package:equatable/equatable.dart';
+import 'package:graphview/GraphView.dart';
+
+abstract class HomeState extends Equatable {
+  const HomeState();
+
+  @override
+  List<Object> get props => [];
+}
+
+class HomeInitial extends HomeState {}
+
+class HomeCounterState extends HomeState {
+  final int counter;
+  const HomeCounterState(this.counter);
+}
+
+class HomeUpdateTree extends HomeState {
+  final Graph graph;
+  final BuchheimWalkerConfiguration builder;
+
+  const HomeUpdateTree({required this.graph, required this.builder});
+
+  @override
+  List<Object> get props => [graph, builder];
+}