Add placeholder SSL certificate how to

Signed-off-by: Diana <[email protected]>

app/_gateway_entities/certificate.md

@@ -6,6 +6,10 @@ entities:
 
 description: A certificate object represents a public certificate, and can be optionally paired with the corresponding private key.
 
+related_resources:
+  - text: Set up {{site.base_gateway}} to serve an SSL certificate for API requests
+    url: /how-to/setup-gateway-to-serve-SSL-certificates
+
 tools:
     - admin-api
     - konnect-api

app/_how-tos/setup-gateway-to-serve-SSL-certificates.md

@@ -0,0 +1,43 @@
+---
+title: Set up {{site.base_gateway}} to serve an SSL certificate for API requests
+content_type: how_to
+related_resources:
+  - text: Certificate entity
+    url: /gateway/entities/certificate
+
+products:
+    - gateway
+
+works_on:
+    - on-prem
+    - konnect
+
+entities: 
+  - certificate
+  - sni
+
+tags:
+    - networking
+
+tldr:
+    q: How do I set up {{site.base_gateway}} to serve an SSL certificate for API requests?
+    a: Answer
+
+tools:
+    - deck
+
+cleanup:
+  inline:
+    - title: Clean up Konnect environment
+      include_content: cleanup/platform/konnect
+      icon_url: /assets/icons/gateway.svg
+    - title: Destroy the {{site.base_gateway}} container
+      include_content: cleanup/products/gateway
+      icon_url: /assets/icons/gateway.svg
+---
+
+@todo
+
+<!--content notes:
+- Use content from this KB: https://support.konghq.com/support/s/article/How-to-setup-Kong-to-serve-an-SSL-certificate-for-API-requests
+-->