QML changes: button now is toggle button, main windows has min size constraint.

Implemented OnClick start/stop sound generation.

Connected model controller with qml ui code.

+ Composed basic project.

+ Improved CMakeLists.txt.

+ Improved CMakeLists.txt, added FindFFMpeg.cmake.

+ Improved CMakeLists.txt, added direct dependencies from qt/ffmpeg install directories.

Added CMakeLists.txt and default project structure.

update README.md