Create README.md

README.md

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+---
+title: Cell–Cell Communication Builder
+emoji: 🧬
+colorFrom: blue
+colorTo: green
+sdk: streamlit
+app_file: app.py
+pinned: false
+license: mit
+---
+
+# Cell–Cell Communication Builder
+
+Build a consistent map of **Secreting cell/tissue → Molecule → Receiving cell/tissue**, then choose the **Signaling type**, **Molecule class**, and **Receptor location**. Click **Test** to validate. Options shuffle each time to encourage reasoning over pattern matching.
+
+## Scenarios
+- Cardiomyocyte signaling
+- Cancer proliferation
+- Synapse signaling
+- HPA axis