added new resources in VNFSnapshotPackageManagement-API

SOL005/VNFSnapshotPackageManagement-API/ApiVersion.robot

...tPackageManagement-API/IndividualVNFSnapshotPackage.robot

...shotPackageManagement-API/VNFSnapshotPackageContent.robot

...NFSnapshotPackageManagement-API/VNFSnapshotPackages.robot

...Management-API/VnfSnapshotPackageManagementKeywords.robot

...NFSnapshotPackageManagement-API/environment/variables.txt

...Management-API/jsons/CreateVnfSnapshotPkgInfoRequest.json

...Management-API/jsons/VnfSnapshotPkgInfoModifications.json

...kageManagement-API/schemas/VnfSnapshotPkgInfo.schema.json

...t-API/schemas/VnfSnapshotPkgInfoModifications.schema.json

...ageManagement-API/schemas/VnfSnapshotPkgInfos.schema.json

...hotPackageManagement-API/zip/sampleVNFSnapshotPackage.zip