This change makes the way the type property is extracted from the
metadata.json file much more robust, and therefore sets a better
example.
Signed-off-by: Arnaud J Le Hors <lehors@us.ibm.com>
Improve on the initial PR to expand on the README with detailed
information on how to run the external chaincode in a container
on the test network and use the node application against it.
Signed-off-by: Arnaud J Le Hors <lehors@us.ibm.com>
