rpk support for protobuf well-known types (#1040)

Author: kbatuigas

modules/get-started/pages/whats-new.adoc

@@ -57,6 +57,10 @@ xref:manage:iceberg/topic-iceberg-integration.adoc[Iceberg-enabled topics] now s
 
 Redpanda now supports normalization of Protobuf schemas in the Schema Registry. You can normalize Avro, JSON, and Protobuf schemas both during registration and lookup. For more information, see the xref:manage:schema-reg/schema-reg-overview.adoc#schema-normalization[Schema Registry overview], and the xref:api:ROOT:pandaproxy-schema-registry.adoc[Schema Registry API reference].
 
+== Protobuf well-known types in `rpk`
+
+Support for https://protobuf.dev/reference/protobuf/google.protobuf/[Protobuf well-known types^] is available in `rpk` when encoding and decoding records using Schema Registry.
+
 == SASL/PLAIN authentication
 
 You now can configure Kafka clients to authenticate using xref:manage:security/authentication#enable-sasl.adoc[SASL/PLAIN] with a single account using the same username and password. Unlike SASL/SCRAM, which uses a challenge response with hashed credentials, SASL/PLAIN transmits plaintext passwords. You enable SASL/PLAIN by appending `PLAIN` to the list of SASL mechanisms.