Add exercise

exercises/06-notifications/instructions.md

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+# Exercise 6
+
+This exercise will demonstrate the use of a Google Chat room as way to send a notification upon a failed build. Given the locked down nature of Google Chat, this exercise will only be demonstrated by the instructor.
+
+## Notifying the Team Upon a Broken Build
+
+1. Change the list of Gradle tasks to `doesnotexist` to emulate a failure. The build will fail as the task doesn't exist in the build script.
+2. Install the [Google Chat Notification plugin](https://plugins.jenkins.io/google-chat-notification).
+3. Create a new chat room in Google Chat named `jenkins-test` at [https://chat.google.com/](https://chat.google.com/).
+4. For the chat room configure the webhook.
+5. Configure the job to send a notification whenever the job fails. Use the webhook generated on Google Chat.
+6. Execute the build. The build should fail and send a notification to the chat room.

exercises/06-notifications/solution/solution.md

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+# Solution
+
+Change the list of Gradle tasks first.
+
+![Gradle Tasks](./images/change-gradle-tasks.png)
+
+Find the plugin and install it.
+
+![Google Chat Plugin](./images/google-chat-plugin.png)
+
+Add a new chat room.
+
+![Chat Room](./images/create-room.png)
+
+For the chat room, click the little cog icon and create a new webhook.
+
+![Add Webhook](./images/add-webhook.png)
+
+Enter an appropriate name for the webhook.
+
+![Webhook Naming](./images/webhook-naming.png)
+
+Copy the generate webhook URL to the clipboard.
+
+![Webhook URL](./images/webhook-url.png)
+
+In the Jenkins job, create a new Google Chat notification. Add the webhook URL and provide a name.
+
+![Notification Configuration](./images/notification-config.png)
+
+Run a build. It should fail and send a new message to the chat room.
+
+![Chat Room Message](./images/chat-room-message.png)