added community showcase w/ Super Bowl example

[josephofiowa]

Description

Please include a summary of the change and which issue is fixed or implemented. Please also include relevant motivation and context (e.g. links, docs, tickets etc.).

https://hart.substack.com/p/how-i-built-realtime-ai-for-broadcast

List any dependencies that are required for this change.

Type of change

Adding a readme to the section to highlight examples built with Roboflow sports.

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• [ X ] New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

Readme edit - renders well

Any specific deployment considerations

n/a

For example, documentation changes, usability, usage/costs, secrets, etc.

Docs

• Docs updated? What were the changes:

Readme change!