Add project README, CONTRIBUTORS.md, and screenshot assets (#4)

Author: vishnuravi

CONTRIBUTORS.md

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+# Contributors
+
+- [Vishnu Ravi](https://github.com/vishnuravi)
+- [Aydin Zahedivash](https://github.com/aydinzahedi)

README.md

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+<img src="assets/logo.png" alt="Stanford Medicine — AI in Medical Education" width="400">
+
+# Stanford AI in Medical Education Open-Access Tools
+
+Interactive learning modules from the [Stanford Medicine AI in Medical Education](https://med.stanford.edu/ai-in-meded.html) program. Deployed to GitHub Pages at [stanfordmed.github.io/aimeded](https://stanfordmed.github.io/aimeded/).
+
+## Modules
+
+### Explore AI Diagnostic Performance
+
+An interactive tool for teaching clinicians how to interpret AI diagnostic metrics using a chest X-ray pneumonia detection example. Features an adjustable threshold slider, ROC and Precision-Recall curves, prevalence effects, and clinical scenario questions.
+
+<img src="assets/ai-evaluation-screenshot.png" alt="Explore AI Diagnostic Performance" width="600">
+
+### Data Security & AI: A HIPAA Module
+
+Explore data security fundamentals, HIPAA regulations, and responsible use of AI tools in clinical settings through interactive scenarios, drag-and-drop exercises, and knowledge checks.
+
+<img src="assets/data-security-screenshot.png" alt="Data Security & AI: A HIPAA Module" width="600">
+
+## Development
+
+### AI Evaluation module
+
+Open `AIEvaluation/index.html` directly in a browser. No build step needed.
+
+### Data Security module
+
+```bash
+cd "Data Security Module v3"
+npm install
+npm run dev
+```
+
+### Deployment
+
+Pushing to `main` triggers a [GitHub Actions workflow](.github/workflows/deploy.yml) that builds the Data Security module, assembles both modules with the landing page, and deploys to GitHub Pages.
+