Bi bo/incoporate findings #7

[BirgitBoss]

• Circularity: add DocumentIdentifierSets for document referencing
  • • copy io.BatteryPass.Circularity directly to IDTA because too many changes
• ContactInformation: add postalCode because not identical to zipCode ([Contact Information 1.0] use postalCode and not zipCode submodel-templates#215)
• use TechnicalData 2.0 and not 1.2
  ** deviation: model technicalPropertyAreas as SMC and not as SML ([TechnicalData 2.0] SML TechnicalPropertyAreas should be an SMC, FurtherInformation SMC should be a SML submodel-templates#175)

Minor changes:

• add payload names starting with capital letters
• update Readme's