NRL-856 configure repository for SDLC-1 compliance

CONTRIBUTING.md

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+# Contribution Guidelines
+
+This repository is maintained by the National Record Locator team within the Transformation Directorate of NHS England.
+We welcome contributions from other teams.
+
+## Raising an Issue
+
+If you raise an issue against this repository, please include as much information as possible to reproduce any bugs,
+or specific locations in the case of content errors.
+
+## Contributing Code
+
+To contribute code, please raise a pull request.
+
+Ideally pull requests should be fairly granular and aim to solve one problem each. It would also be helpful if they
+linked to an issue. If the maintainers cannot understand why a pull request was raised, it will be rejected,
+so please explain why the changes need to be made (unless it is self-evident) or reference the issue they solve.
+
+Code owners are notified daily about any pending pull requests via automated tools. If your pull request is not
+yet ready for review, please consider keeping it marked as a Draft.
+
+### Naming and committing conventions
+
+Branch names should be of the format:
+
+`feature/[Shortcode]-[Jira-ref]-short-issue-description`
+e.g.
+`feature/shco1-NRL-123-contribution-guidelines`
+
+Multiple branches are permitted for the same ticket.
+
+Please include the Jira reference in your commit messages.
+
+Your pull request title should include the ticket reference and a short summary of the change;
+these are used to compile the release notes for each iteration.
+
+## Specification Changes
+
+If your submission changes the behaviour of the NRL, please consider whether the user-facing documentation
+should be updated at the same time to reflect these changes. There are two related repositories containing
+the specifications [for Producers](https://digital.nhs.uk/developer/api-catalogue/national-record-locator-fhir/v3/producer)
+and [Consumers](https://digital.nhs.uk/developer/api-catalogue/national-record-locator-fhir/v3/consumer)
+of NRL pointers, respectively:
+
+- [NRL Producer API](https://github.com/NHSDigital/nrl-producer-api)
+- [NRL Consumer API](https://github.com/NHSDigital/nrl-consumer-api)