create an example for banking account/balance transfering

**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 `
- any other relevant commands

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