Add Slack channel for Akri

Signed-off-by: Edrick Wong <edwong@microsoft.com>

Project URL: https://github.com/deislabs/akri

Description of Request:
Need a place to discuss Akri matters with the community

communication/slack-config/channels.yaml

@@ -3,6 +3,7 @@
 
 channels:
   - name: airflow-operator
+  - name: akri
   - name: aks-engine-users
   - name: aks-engine-dev
     id: CU1CXUHN0