First part of a user guide for GCE in jclouds

"...is to run the examples. Download the [jclouds-example](...) repository and build the [google](https://github.com/jclouds/jclouds-examples/tree/master/google) subproject. For details on how to run the examples, see the [README](...)."

And create a README file in the examples repo similar to the [Rackspace example README](https://github.com/jclouds/jclouds-examples/blob/master/rackspace/README.md)? Then we can also remove the next paragraph, which probably belongs in that README. The same might also go for the last paragraph?