Add validCodes.sql file to compute list of ICD10 codes that can be mapped to.
Add validCodes.sql file to compute list of ICD10 codes that can be mapped to.

IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service