added pipeline script for Hangouts Chat

pipeline-examples/hangoutsChatNotify/README.md

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+# Synopsis
+Use a Hangouts Chat webhook to send an arbitrary message.
+
+# Background
+Using a combination of groovy and curl from shell, send a message to Hangouts Chat for notifications.
+Some of the more friendly groovy http libs like HTTPBuilder are not easily available. However,
+we can use groovy's built in json handling to build up the request and ship it to a command
+line curl easily enough.
+
+This will require that you configure a webhook integration in Hangouts Chat (not the Jenkins specific configuration.)

pipeline-examples/hangoutsChatNotify/hangoutsChatNotify.groovy

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+import groovy.json.JsonOutput
+// Add whichever params you think you'd most want to have
+// replace the chatURL below with the hook url provided by
+// Hangouts when you configure the webhook
+def notifyHangoutsChat(text) {
+ def chatURL = 'https://chat.googleapis.com/v1/spaces/xxxxxxx/messages?key=API_KEY'
+ def payload = JsonOutput.toJson([text : text])
+ sh "curl -X POST ${chatURL} \ -H 'Content-Type: application/json' \ -d '${payload}'"
+}