Document how to select camera parameters

@dinhhuy2109 Please create a wiki where you explain how to tune the [camera parameters](https://github.com/crigroup/ensenso/blob/kinetic-devel/cfg/CameraParameters.cfg).
Something like [this](http://www.ensenso.com/manual/index.html?performance_quality_settings.htm) but including pics.
Specially for the post-processing parameters.
