Create README.md

README.md

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+# 🧬 Interdependence Concept Game (Streamlit on Hugging Face Spaces)
+
+An interactive, staged practice tool for **negative feedback loops** and **interdependence of body systems**.  
+Scenarios included:
+- **Blood Pressure (Hypotension)** → Baroreflex (nervous), RAAS (renal)
+- **Glucose (Post-meal Hyperglycemia)** → Insulin loop, Kidney overflow/excretion
+- **Temperature (Hypothermia)** → Shivering (somatic motor), Skin vessel loop (autonomic)
+
+Each loop walks students through:
+1) **Build the loop** (Sensor → Control Center → Effector)  
+2) **Sensor → Control** signaling (type, receptor location, primary transport/gradient)  
+3) **Control → Effector** signaling  
+4) **Outcome** (loop-specific response)
+
+When both loops in a scenario are completed, students can download a **PDF certificate** (requires `reportlab`).
+
+---
+
+## ▶️ Run in Hugging Face Spaces (Docker mode)
+
+This Space is set up to run via **Docker**. The container launches Streamlit with:
+
+```bash
+streamlit run app.py --server.port=$PORT --server.address=0.0.0.0