public Builder putResponseTemplate(String mimeType, String template) {
            responseTemplates.put(mimeType, template);
            return this;
        }
Adds a response template for a MIME type.

@param mimeType MIME type of the response template.
@param template Response template for the payload.
@return Returns the builder.
@see IntegrationResponse#getResponseTemplates()
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/IntegrationResponse.java