feat: Create admin and register polls app

resolved #9

- 관리자 생성
- polls app 관리자 사이트에 등록

Author: devpla

mysite/db.sqlite3

@@ -1,3 +1,4 @@
 from django.contrib import admin
+from .models import Question
 
-# Register your models here.
+admin.site.register(Question)