Standardized README to Markdown format

README.md

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+# README for the Adaptive Exponential Integrate-and-Fire Model
+
+This is the readme for the model associated with the paper:
+
+Touboul J, Brette R (2008) Dynamics and bifurcations of the adaptive exponential integrate-and-fire model *Biol Cyber* 99(4-5):319-34
+
+This is the Brian code that the authors used and was contributed by R Brette.
+
+## Some notes on the included files:
+
+- **Diagram.py**: Figs 3 and 4
+- **spikes.py**: Figs 5 and 6
+- **chaos.py**: Fig 7
+- **behaviors.py**: Response of Brette-Gerstner model with different parameter values
+
+---
+
+2025-06-02: Standardized to Markdown.