Add README
Add README

[#108058442]

Signed-off-by: George Dean <e69f7f98b24eb3c7fbe57081171ad9925bf5cbf1@pivotal.io>

pivotal-cf-experimental/bosh-bootloader,niroyb/bosh-bootloader,pivotal-cf-experimental/bosh-bootloader,niroyb/bosh-bootloader