Committer: QAM: new app Msg for posts. 留言完成. 需考慮刪除留言

 On branch master
 Your branch is up-to-date with 'origin/master'.
 Changes to be committed:
	new file:   Msg/__init__.py
	new file:   Msg/admin.py
	new file:   Msg/models.py
	new file:   Msg/tests.py
	new file:   Msg/views.py
	modified:   TFT_project/settings.py
	modified:   db.sqlite3
	modified:   posts/views.py
	modified:   templates/post_detail.html