Upload README.md

README.md

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+---
+title: Flow Down Gradients — Simple Explorer
+emoji: 🌬️
+colorFrom: blue
+colorTo: green
+sdk: streamlit
+app_file: app.py
+pinned: false
+---
+
+# Flow Down Gradients — Simple Explorer
+
+## Pressure (Alveolus ↔ Capillary)
+- Choose a **preset**: Demo, Preset 1–3 (values in **mmHg**, including **Thoracic pressure**).
+- Diagram shows **O₂ (Blue • Circle)** and **CO₂ (Orange • Square)** with labels **Alveolus** and **Capillary**.
+- Clean, accessible legend (color + shape cues).
+
+## Concentration: Action Potential (extracellular ↔ intracellular)
+- Choose **Preset 1–3** (more **Na⁺**, more **K⁺**, and **which side is more negative**).
+- Labels: **Extracellular** ↔ **Intracellular** with **+/−** signs above the labels.
+- Static visual (no animation) to pair with Canvas prompts.
+
+## Run locally
+```bash
+pip install streamlit numpy matplotlib
+streamlit run app.py
+```
+
+## Deploy on Hugging Face Spaces (Streamlit)
+Upload **`app.py`**, **`requirements.txt`**, and this **`README.md`** to a Streamlit Space.