update readme

README.md

@@ -3,6 +3,34 @@ Send slack notification with BQ results.
 It simply uses JSON.stringify to send results.
 Bare minimum implementation, please don't complain.
 
+## How to use
+
+### Sample github actions workflow yaml
+
+```yaml
+name: Run SQL against BQ and notify slack
+on:
+  schedule:
+    - cron:  '0 10 * * *' # run every day at 10:00
+
+jobs:
+  bq2slack:
+    runs-on: ubuntu-latest
+    name: Execute SQL query and send results to Slack
+    steps:
+      - name: Run
+        uses: data-i-consulting/bq2slack-github-action@v1.0.5 # use the latest tag
+        with:
+          slack_webhook: ${{secrets.SLACK_WEBHOOK}}
+          gcp_service_account: ${{secrets.GCP_SERVICE_ACCOUNT}}
+          sql: |
+            WITH something AS (
+              SELECT 1 as my_number
+            )
+
+            SELECT * FROM something
+```
+
 ## Development
 ```bash
 npm i