Add link to Samples Readme.md

Now that the samples have been moved to their own project, it should at
least be mentioned where to find them.
Fixed GeoSphere's texture mapping issues

Some triangles were not being rendered correctly: two more indices
needed to be swapped around. Also I updated the reference to the correct
indices array to be passed to the GeometricPrimitive constructor
Merge branch 'master' of https://github.com/AvengerDr/SharpDX into master_integration