Add business registry api postman collection

web/site/content/en-CA/products/br/overview.md

@@ -76,6 +76,8 @@ All data with times are in UTC, both submitted and retrieved via the API. These
 
 - Refer to the <a href="https://www2.gov.bc.ca/" target="_blank">BC Gov site</a> to answer any business rule related questions including <a href="https://www2.gov.bc.ca/gov/content/employment-business/business/managing-a-business/permits-licences/businesses-incorporated-companies/forms-corporate-registry" target="_blank">Fees</a>
 
+- Download a <a href="br/apigw-business-api-demo.postman_collection.json.zip" download="apigw-business-demo-postman.json" target="_blank">Demo Postman collection</a> to view at least one example of each API path. Provide your own API key and account Id to submit requests and view the responses.
+
 - Refer to the <a href="https://www.bcregistry.gov.bc.ca/" target="_blank">BC Registry site</a> to open an account and see all the Registry services.
 
 - Refer to the <a href="https://discourse.onebc.ca/" target="_blank">Discourse Community site</a> to answer any API and service related questions.