Include mvn package in answer store instructions
Include mvn package in answer store instructions

Since the json file is generated, users need to build the project.  It's possible that they could get to this point of the instructions without building the project yet.

Closes issue #45
Rygbee/questions-with-classifier-ega,Rygbee/questions-with-classifier-ega,Rygbee/questions-with-classifier-ega,Rygbee/questions-with-classifier-ega