Improve details in docs

The docs seem very sparse, especially with:

Work with a variety of file formats

What do these include?

[abeckus]

It can load ATGI and Collada models.
Currently we don't have any plan to add support for additional file formats.
However, user can add support for additional formats by implementing ResourceFactory.
Please look at: LvEd_Initialize(...) function in
LevelEditor\LevelEditorNativeRendering\LvEdRenderingEngine\LvEdRenderingEngine.cpp

Alan