add LOINC license

[kingmanzhang]

We should check clause 9 of LOINC license and handle properly.

[kingmanzhang]

should also check the license for FHIR logo:
HL7®, HEALTH LEVEL SEVEN®, FHIR® and the FHIR ® are trademarks owned by Health Level Seven International, registered with the United States Patent and Trademark Office.
http://hl7.org/fhir/2018Sep/license.html