Create README_imx6qsabresd.md
README.md: Result building fsl-image-machine-test for imx6qsabresd
Merge pull request #32 from gmacario/more-readme

README.md: Result building fsl-image-machine-test for imx6qsabresd
Improve error handling

Do not stop if source directory does not exist

Signed-off-by: Gianpaolo Macario <gmacario@gmail.com>