added field oafEntity.eoscifguidelines #17

This PR adds to the internal graph data model the field eoscifguidelines, possibly characterising any graph entity. In fact it is defined on the abstract class OafEntity and it is characterised by a new bean defining the following quad:

code, label, url, semanticRelation

This PR adds to the internal graph data model the field `eoscifguidelines`, possibly characterising any graph entity. In fact it is defined on the abstract class `OafEntity` and it is characterised by a new bean defining the following quad: ``` code, label, url, semanticRelation ```

 @ -0,0 +15,4 @@
     /**
      * EOSC-IF code
      */
     private String code;

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added field oafEntity.eoscifguidelines #17

Step 1:

Step 2:

 @ -21,6 +21,8 @@ public abstract class OafEntity extends Oaf implements Serializable {
 	private OAIProvenance oaiprovenance;
 	private List<EoscIfGuidelines> eoscifguidelines;