Ubuntu 15.10 build dependencies and make command

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Please update README.md

sudo apt-get install qtdeclarative5-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev qtmultimedia5-dev libqt5multimediawidgets5 libqt5multimedia5-plugins libqt5multimedia5
qtchooser -qt=qt5 -run-tool=qmake BBQScreenClient2.linux.pro

Ignore warning:

Project MESSAGE: You are running qmake on a generated .pro file. This may not work!
RCC: Warning: No resources in 'mainwindow.qrc'.

Just run make.