Standardize readme

README.md

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+This is the readme for the model associated with the paper
+
+Park C, Rubin JE (2013) Cooperation of intrinsic bursting and calcium 
+oscillations underlying activity patterns of model pre-Botzinger 
+complex neurons. *J Comput Neurosci* 34:345-66
+
+This model written in XPP was implemented by Jon Rubin and Choongseok 
+Park.
+
+XPP is freely available at [http://www.math.pitt.edu/~bard/xpp/xpp.html](http://www.math.pitt.edu/~bard/xpp/xpp.html)
+
+To run the model in its default setting start with a command like 
+(depends on your platform):
+
+xppaut OneCellTwoOsc.ode
+
+Once XPP starts select Initalconds -> (G)o to see a figure like this:
+
+![screenshot](./screenshot.png)
+
+Inside XPP, use File -> Read set with the included set files to get 
+certain dynamics from the paper:
+
+OneCellTwoOsc.ode.setsb <-> the paper's Fig. 2a,  
+![fig 2a](./fig2a.png)
+
+OneCellTwoOsc.ode.setdb <-> the paper's Fig. 2b,  
+![fig 2b](./fig2b.png)
+
+OneCellTwoOsc.ode.setsdb <-> the paper's Fig. 2c  
+![fig 2c](./fig2c.png)
+
+---
+
+2025-07-09: Converted README to Markdown.