Merge pull request #233 from nginx/internal/nginxaas-certs

docs: add certs overview page for NGINXaaS for Google

Author: JTorreG

content/nginxaas-google/getting-started/ssl-tls-certificates/overview.md

@@ -14,23 +14,27 @@ This document provides details about using SSL/TLS certificates with your F5 NGI
 
 ## Supported certificate types and formats
 
+NGINXaaS supports certificates of the following types:
 
+- Self-signed
+- Domain Validated (DV)
+- Organization Validated (OV)
+- Extended Validation (EV)
 
-## Add SSL/TLS certificates
-
-
-
-### Add SSL/TLS certificates bundled with NGINXaaS configuration
+NGINX supports the following certificate formats:
 
+- PEM format certificates.
 
+NGINXaaS allows you to upload these certificates as text and as files.
 
-## Certificate rotation
+Encrypt your certificates, keys, and PEM files using one of these standards:
 
+- RSA
+- ECC/ECDSA
 
 
-## Monitor certificates
-
-
+## Add SSL/TLS certificates
 
-## Common certificate errors
+Add a certificate to your NGINXaaS deployment using your preferred client tool:
+* [Add certificates using the NGINXaaS Console]({{< ref "/nginxaas-google/getting-started/ssl-tls-certificates/ssl-tls-certificates-portal.md" >}})