more slack config

Change-Id: I5c8d381d0bea7c814c683ce3f44ee09b06e2727d
diff --git a/jenkins.plugins.slack.webhook.GlobalConfig.xml b/jenkins.plugins.slack.webhook.GlobalConfig.xml
new file mode 100644
index 0000000..514d9ab
--- /dev/null
+++ b/jenkins.plugins.slack.webhook.GlobalConfig.xml
@@ -0,0 +1,5 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<jenkins.plugins.slack.webhook.GlobalConfig plugin="slack@2.0.1">
+  <slackOutgoingWebhookToken></slackOutgoingWebhookToken>
+  <slackOutgoingWebhookURL></slackOutgoingWebhookURL>
+</jenkins.plugins.slack.webhook.GlobalConfig>