added slack message to workflow

Author: fraisai

.github/workflows/slack-notify.yml

@@ -0,0 +1,16 @@
+name: Slack Notification of CI Status
+
+on: 
+    push:
+        branches: ["feature/raisa-cicd"]
+            
+jobs:
+    slackNotification:
+        name: Slack CI status message
+        runs-on: ubuntu-latest
+        steps:            
+            - name: Slack Notify on Failure
+              uses: slackapi/slack-github-action@v1.24.0
+              env:
+                SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+                SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK