Created new Fortanix KMIP topic for TDE (#368)

Since we can use Fortanix, I added it to the config KMIP section, it
tells the user where to look for more details on setting it up and
provides a bit of examples with pg_tde_add_global_key_provider_kmip

contrib/pg_tde/documentation/docs/global-key-provider-configuration/kmip-fortanix.md

@@ -0,0 +1,5 @@
+# Fortanix KMIP Server Configuration
+
+`pg_tde` is compatible with Fortanix Data Security Manager (DSM) via the KMIP protocol. For a full setup guide, see [the Fortanix KMIP documentation here](https://support.fortanix.com/docs/users-guide-account-client-configurations?highlight=KMIP#23-kmip-clients).
+
+For more information on adding or modifying the provider, see the [Adding or modifying KMIP providers](https://docs.percona.com/pg-tde/functions.html?h=pg_tde_add_global_key_provider_kmip#adding-or-modifying-kmip-providers) topic.

contrib/pg_tde/documentation/mkdocs.yml

@@ -170,6 +170,7 @@ nav:
     - "2.1 Configure Key Management (KMS)": 
       - "2.1 Configure Key Management (KMS)": global-key-provider-configuration/index.md
       - "KMIP Configuration": global-key-provider-configuration/kmip-server.md
+      - "Fortanix Configuration": global-key-provider-configuration/kmip-fortanix.md  
       - "Vault Configuration": global-key-provider-configuration/vault.md
       - "Thales Configuration": global-key-provider-configuration/kmip-thales.md
       - "Keyring File Configuration": global-key-provider-configuration/keyring.md