readme.md missing from quickstarts

[philenz]

The incredibly useful readme.md files from https://github.com/danielsollondon/azvmimagebuilder haven't been copied across to this repository.

(e.g.: https://github.com/danielsollondon/azvmimagebuilder/blob/master/quickquickstarts/0_Creating_a_Custom_Linux_Managed_Image/readme.md)