Finish user log in to endi's account + rename some files and class

lib/theme/style.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+
+ThemeData appTheme() {
+  return ThemeData(
+    scaffoldBackgroundColor: Colors.white,
+    fontFamily: 'Varela Round',
+    textTheme: TextTheme(
+        bodyText1: TextStyle(fontSize: 16.0, color: Colors.black),
+        button: TextStyle(
+            fontSize: 17.0, color: Colors.white, fontWeight: FontWeight.bold),
+        headline1: TextStyle(fontSize: 26.0, color: Colors.black),
+        headline2: TextStyle(fontSize: 21.0, color: Colors.black)),
+    buttonTheme: ButtonThemeData(
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30.0)),
+      padding: EdgeInsets.fromLTRB(20.0, 15.0, 20.0, 15.0),
+      buttonColor: Colors.indigo[900],
+    ),
+  );
+}