Merge pull request #30 from NHSDigital/feature/eli-216-adding-APIM-target-headers

eli-216 adding APIM target headers to allow us to receive NHS Login NHS number

Author: eddalmond1

specification/eligibility-signposting-api.yaml

@@ -774,3 +774,6 @@ x-nhsd-apim:
         $ref: "x-nhsd-apim/target.yaml"
     ratelimiting:
         $ref: "x-nhsd-apim/ratelimit.yaml"
+    target-identity:
+      - name: nhs-login-nhs-number
+        header: "nhs-login-nhs-number"