first commit
利用MVC模式，实现以下App，App首界面具有
点击LOGIN按钮后进型判断，用户名密码判断如果用户名和密码符合
如学号为17023118的同学输入
则跳转到第二个界面并显示LOGOUT，如果不符合则跳转到第二个界面不显示LOGOUT
<EditText />
mUserName = editText.getText();
mPassword = editText.getText();
请Fork本库，并请使用Pull Request方式进行作业提交
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