docs: add Callie app to showcase

[daehyeonmun2021]

This PR is for adding Callie: Food & Self-Care to the React Native Showcase.

Callie is an app that supports individuals experiencing eating disorders by helping them track meals, self-care routines, and recovery-focused habits with a compassionate.

The app was selected as the “Most Creative” winner in the Expo App Awards, an award recognizing apps that surprise, delight, and push design into new territory through imaginative and thoughtful product execution.

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[Simek]

Hey @daehyeonmun2021, you should use the form linked at the end of the page to submit entry propositions for the app Showcase:

• https://forms.gle/BdNf3v5hemV9D5c86

[daehyeonmun2021]

@Simek ✅ Submitted. Thanks Simek !