README: add symlink
README: add symlink

The YP compliance requires the file README in the layer root dir. So far we are
using README.md for convenience, since the project is hosted on github and we
use markdown language.

Signed-off-by: Nicolas Dechesne <05fca36dfcf68f7e1c9eaf62b074676ab50a133b@linaro.org>

ndechesne/meta-qualcomm,ndechesne/meta-qcom,ndechesne/meta-qcom,ndechesne/meta-qcom