added splashscreen, login and add hp number pages

lib/services/other_function.dart

@@ -0,0 +1,18 @@
+import 'package:intl/intl.dart';
+
+class OtherFunction {
+  int umur(String tanggalLahir) {
+    // change tanggalLahir to DateTime
+    DateTime date = DateTime.parse(tanggalLahir);
+    // get current date
+    DateTime now = DateTime.now();
+    // get difference in year
+    int year = now.year - date.year;
+    return year;
+  }
+
+  String commaFormat(int number) {
+    final formatter = NumberFormat('#,###');
+    return formatter.format(number);
+  }
+}