Merge pull request #32 from aleksandr-oleinikov/aidbox-sdc-api-genera…

…te-link

Add aidbox-sdc-api.md

reference/aidbox-forms/aidbox-sdc-api.md

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+---
+description: Custom SDC operations supported by Aidbox Forms.
+---
+
+* [$generate-link](aidbox-sdc-api.md#generate-a-link-to-a-questionnaireresponse-usdgenerate-link)
+
+# Generate a link to a QuestionnaireResponse - $generate-link
+
+This operation generates a link to a web page to be used to continue answering a specified [QuestionnaireResponse](https://hl7.org/fhir/R4/questionnaireresponse.html).
+
+## URLs
+
+```
+POST [base]/QuestionnaireResponse/[id]/$generate-link
+```
+
+## Parameters
+
+### allow-amend
+
+Whether the generated link will allow amending and re-submitting the form.
+
+```
+name: allow-amend
+value:
+  Boolean: true
+```
+
+### redirect-on-submit
+
+A URL where the user will be redirected to after successfully submitting the form.
+
+```yaml
+name: redirect-on-submit
+value:
+  String: https://example.com/submit-hook?questionnaire=123
+```