Add .gitignore for QT project

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
First add basic project from QtCreator

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
main.qml: Add Quit button on left-top corner

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
info: Add Info class

We will use this class to make QML communicate with C++

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
main.cpp: Register Info class to QQmlApplicationEngine rootContext

Now we can use _info to communicate with C++ Info class.

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
main.cpp: Fix compile error

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
main.qml: Add simple button to make QML get/set to Info class

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>