create an example for banking account/balance transfering

[loveyandex]

Description
A clear and concise description of what the issue is.

There are many examples in this repo, so identify the example by linking to the relevant documentation page.

Troubleshooting
Identify any existing issues that seem related: https://github.com/confluentinc/examples/issues?q=is%3Aissue

If applicable, please include the output of:

• docker-compose logs <container name>
• any other relevant commands

Environment

• GitHub branch: [e.g. 6.0.1-post, etc]
• Operating System:
• Version of Docker:
• Version of Docker Compose: