add notes

README.md

@@ -25,4 +25,7 @@ curl -X PUT http://localhost:3000/analyze-dmp -F "url=http://example.com/file.dm
 az group create --name <your-resource-group> --location eastus2
 az deployment group create --resource-group <your-resource-group> --template-file template.json
 ```
-Once deployed, the SWA will now be pointed at your repo and is waiting for a build to be submitted. You must create and configure your own GithubAction for this portion of the deployment.
+Once deployed, the SWA will now be pointed at your repo and is waiting for a build to be submitted. You must create and configure your own GithubAction for this portion of the deployment.
+
+## Notes
+- The `REACT_APP_API_URL` must not end in a trailing slash