Resolve "Add the TMF628 Performance Management API model"

.gitignore

pom.xml

src/main/java/org/etsi/osl/tmf/common/model/Addressable.java

src/main/java/org/etsi/osl/tmf/common/model/Entity.java

src/main/java/org/etsi/osl/tmf/common/model/EntityRef.java

src/main/java/org/etsi/osl/tmf/common/model/Error.java

...ain/java/org/etsi/osl/tmf/pm628/model/AddressableMVO.java

...ava/org/etsi/osl/tmf/pm628/model/AdministrativeState.java

...n/java/org/etsi/osl/tmf/pm628/model/AttachmentRefFVO.java

...n/java/org/etsi/osl/tmf/pm628/model/AttachmentRefMVO.java

src/main/java/org/etsi/osl/tmf/pm628/model/BaseEvent.java

...ain/java/org/etsi/osl/tmf/pm628/model/Characteristic.java

.../java/org/etsi/osl/tmf/pm628/model/CharacteristicFVO.java

.../java/org/etsi/osl/tmf/pm628/model/CharacteristicMVO.java

.../etsi/osl/tmf/pm628/model/CharacteristicRelationship.java

...si/osl/tmf/pm628/model/CharacteristicRelationshipFVO.java

...si/osl/tmf/pm628/model/CharacteristicRelationshipMVO.java

...ain/java/org/etsi/osl/tmf/pm628/model/CollectionType.java

...ava/org/etsi/osl/tmf/pm628/model/CompressionEnumType.java

...in/java/org/etsi/osl/tmf/pm628/model/CompressionType.java