NEW: MIH Authentication Provider Setup

Frontend/lib/mih_components/mih_providers/mih_authentication_provider.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/foundation.dart';
+
+class MihAuthenticationProvider extends ChangeNotifier {
+  int toolIndex;
+
+  MihAuthenticationProvider({
+    this.toolIndex = 0,
+  });
+
+  void setToolIndex(int index) {
+    toolIndex = index;
+    notifyListeners();
+  }
+}