[pacsat-dev] Launchpad instructions

As requested I updated the README with instructions to use the launchpad. If someone could try this and then tell me if it does not work any more then that would be great. It worked here some time ago, buts its hard to go back and try this from scratch.

The readme shows up on the default page here: https://github.com/AMSAT-NA/PacSatSW

regards, Chris