first draft (#3226)

Author: nastasha-solomon

shared/attributes.asciidoc

@@ -362,6 +362,7 @@ Do not use `endpoint-cloud-sec` in versions 8.5.0 and newer
 :bedrock:                 Amazon Bedrock
 :gemini:                  Google Gemini
 :hive:                    TheHive
+:xsoar:                   XSOAR
 :monitoring:              X-Pack monitoring
 :monitor-features:        monitoring features
 :stack-monitor-features:  {stack} {monitor-features}