Merge pull request #1911 from alphagov/document-simple-smart-answers

Document Simple Smart Answers

docs/simple-smart-answer.md

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+# Simple Smart Answer
+
+[Simple smart answers](https://docs.publishing.service.gov.uk/document-types/simple_smart_answer.html) work for complex situations with multiple variables and outcomes, where using this format will simplify the user journey.
+A simple smart answer is a series of questions that channels a user to a certain outcome based on their responses. They use simple decision tree logic and don’t involve calculations.
+They differ from standard [smart answers](https://github.com/alphagov/smart-answers), which generally require a developer to maintain.
+
+Examples of Simple Smart Answers:
+- [Contact DVSA](https://www.gov.uk/contact-dvsa)
+- [Find out if you can check someone’s criminal record](https://www.gov.uk/find-out-dbs-check)