Initial work on VNF Performance Management

...03/VNFPerformanceManagement-API_nxw/IndividualPmJob.robot

SOL003/VNFPerformanceManagement-API_nxw/PMJobs.robot

...nagement-API_nxw/SOL003-VNFPerformanceManagement-API.json

...ormanceManagement-API_nxw/environment/IndividualPmJob.txt

.../VNFPerformanceManagement-API_nxw/environment/generic.txt

...3/VNFPerformanceManagement-API_nxw/environment/pmJobs.txt

...rformanceManagement-API_nxw/jsons/CreatePmJobRequest.json

.../VNFPerformanceManagement-API_nxw/jsons/subscriptios.json

...NFPerformanceManagement-API_nxw/schemas/PmJob.schema.json

...anceManagement-API_nxw/schemas/ProblemDetails.schema.json

...erformanceManagement-API_nxw/schemas/criteria.schema.json

...NFPerformanceManagement-API_nxw/schemas/links.schema.json

...PerformanceManagement-API_nxw/schemas/reports.schema.json