Track scores

main.py

@@ -109,6 +109,8 @@ class QuizzerApp(App):
         question = self.questions[-1] if len(self.questions) > 0 else QuizzerApp.DEFAULT_QUESTION
         self.paused = True
         self.correct = answer == question[2]
+        if self.correct:
+            self.score += 1
         Clock.schedule_once(lambda delta: self.unpause(), PAUSE_TIME)
 
     def unpause(self):