Create a vocabulary URI for EJPRD UNIQUE entities

[S2Ola]

Create a new namespace for the unique entities in EJPRD schema

1. Create the URI for the ejprd vocabulary
2. Create the URI defining the ejprd classes
3. Create the URI for defining the ejprd properties

[S2Ola]

for action :

1. For defining ejprd vocabulary : https://www.ejprarediseases.org/metdata/core
2. For defining the ejprd classes: https://www.ejprarediseases.org/metadata/core#ClassesA
3. For defining the ejprd properties: https://www.ejprarediseases.org/metadata/core#PropertiesA

[S2Ola]

Adding the naming structure to the ejprd terms