Add pointer to set up contract tests for new apps
Add pointer to set up contract tests for new apps

This was missed for the new Locations API app.

Note that the link won't work until [^1] is merged.

[^1]: https://github.com/alphagov/govuk-developer-docs/pull/3498

alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs