Added DocRef based on IHE with backport extension

Author: jkiddo

input/fsh/DkCoreDocumentReference.fsh

@@ -0,0 +1,4 @@
+Profile: DkCoreDocumentReference
+Parent: MinimalDocumentReference
+Id: dk-core-documentreference
+* extension contains http://hl7.org/fhir/5.0/StructureDefinition/extension-DocumentReference.version named version 1..1

sushi-config.yaml

@@ -38,8 +38,10 @@ parameters:
   path-expansion-params: Parameters-expParam.json
 
 dependencies:
+  hl7.fhir.extensions.r5: 4.0.1
   hl7.fhir.uv.phd: 1.1.0
   hl7.fhir.uv.ipa: 1.0.0
+  ihe.iti.mhd: 4.2.2
 
 
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