Standardized README to Markdown format

README.md

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+# Readme for Okamoto et al. Model
+
+This is the readme file for the model associated with:
+
+Okamoto H, Isomura Y, Takada M, Fukai T (2007) Temporal integration by stochastic recurrent network dynamics with bimodal neurons. *J Neurophysiol* 97:3859-67
+
+## Usage
+
+Compile the ANSI C program with, for example under Linux:
+
+```bash
+gcc -o run.exe Okamoto_etal_program.c -lm
+```
+
+then type
+
+```bash
+./run.exe
+```
+
+and enter a numerical seed for the random number generator.
+
+The program finishes in less than a minute and produces two data files whose graphs should look like:
+
+![screenshot](./screenshot.jpg)
+
+---
+
+2025-05-30: Standardized to Markdown