Reworded readme and put in reference to E/R diagram
Reworded readme and put in reference to E/R diagram

divino/marklogic-data-hub,divino/marklogic-data-hub,marklogic/data-hub-in-a-box,divino/marklogic-data-hub,marklogic/data-hub-in-a-box,divino/marklogic-data-hub,marklogic/data-hub-in-a-box,marklogic/data-hub-in-a-box,divino/marklogic-data-hub