Add README.md for Diffusion Explorer project

Add README for Diffusion Explorer project with details on concept, features, installation, usage, and technologies.

Author: ghostdeveloper404

README.md

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+
+# Diffusion Explorer
+
+Interactive Neural Diffusion Simulator
+
+## Concept
+
+A web-based simulation tool that visualizes why diffusion fails for long-distance neural signaling, making the **<x²> = 2Dt** law intuitive.
+
+## Key Features
+
+- **3D Visualization** of ion diffusion at different scales (synapse, dendrite, axon)
+- **Time Calculator** showing how long it takes for neurotransmitters/ions to diffuse specific distances
+- **Comparison Tool** between diffusion vs. action potential propagation speeds
+- **Parameter Explorer** showing how temperature, viscosity, and ion size affect diffusion constant D
+
+## Installation
+
+```bash
+git clone https://github.com/yourusername/diffusion-explorer.git
+cd diffusion-explorer
+```
+
+## Usage
+
+Open `http://localhost:3000` in your browser. Use the UI controls to adjust diffusion parameters and observe real-time visualization updates.
+
+## Technologies
+
+- **library**: Three.js
+- **Simulation**: Custom diffusion algorithms
+- **Visualization**: WebGL