Write a case study about using DataFusion

### Is your feature request related to a problem or challenge?

Part of getting people to use DataFusion is to hear what other people are doing with it, why, and what success they found

This helps potential new users evaluate if they want to spend more time learning about DataFusion

### Describe the solution you'd like

I would love it if people wrote some case studies (1-2 page):
1. What their project is
2. How they use DataFusion
3. Why they chose DataFusion
4. What features of DataFusion they use

### Describe alternatives you've considered

_No response_

### Additional context

This was suggested by @MrPowers

No target project, contributor, or documentation location is named. Start by identifying a DataFusion user and where case studies belong, then prepare a 1–2 page account covering the project, DataFusion usage, reasons for choosing it, and features used; done means the case study is ready to publish.

Written by the indexing model from the issue text.