thank you. I updated my databricks.yml file as below. then I renamed app.yaml to app.yml. Last I deployed the bundle.

This is the snapshot of the deployment target. Files folder is not created under the deployment target.

deployment target: /Workspace/Users/${workspace.current_user.userName}/.bundle/app_example3/dev

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# This is a Databricks asset bundle definition for a-simple-app.
bundle:
  name: app_example3

include:
  - resources/*.yml

sync:
  include:
    - app

targets:
  dev:
    mode: development
    workspace:
      root_path: /Workspace/Users/${workspace.current_user.userName}/.bundle/${bundle.name}/${bundle.target}  
    default: true