A first unfinished version of the build instructions for windows

The old one is outdated, as i mentioned in a previous issue.
I cannot yet build it, this is the error output:

D:\Prog\mp\dev\apm_planner>qmake -tp vc qgroundcontrol.pro
Project MESSAGE: Qt version 5.2.1
Project MESSAGE: Windows build
Project MESSAGE: Release flavor
Project MESSAGE: BASEDIR D:/Prog/mp/dev/apm_planner DESTDIR D:/Prog/mp/dev/apm_planner/release TARGET apmplanner2
Project MESSAGE: Skipping support for QUpgrade
Project MESSAGE: Skipping support for OpenSceneGraph
Project MESSAGE: Skipping support for Google Earth
Project MESSAGE: Skipping support for Protocol Buffers
Project MESSAGE: Skipping support for libfreenect
Project MESSAGE: Adding ALGLIB D:/Prog/mp/dev/apm_planner/libs/alglib
Project MESSAGE: Including support for XBee
Project MESSAGE: Including support for Magellan 3DxWare
Project MESSAGE: Skipping support for Opal-RT
Project ERROR: Unknown module(s) in QT: phonon