Standardized README to Markdown format

README.md

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+This is the source code for the model used in the following paper:
+
+Maran SK, Sieling FH, Demla K, Prinz AA, Canavier CC. "Responses of a  
+bursting pacemaker to excitation reveal spatial segregation between  
+bursting and spiking mechanisms". *J Comput Neurosci*. 2011 Mar 1.  
+[Epub ahead of print]  
+PubMed PMID: 21360137; PubMed Central PMCID: PMC3160527.
+
+There are three files - ABPDdriver.c, ABPDcon.h and ABPD.h.  
+- **ABPDcon.h** has the values for different parameters such as  
+  conductance strength, reversal potentials etc  
+- **ABPD.h** has the code for kinetic equations and current  
+  equations of different channels. Also the code for numerical  
+  method.  
+- **ABPDdriver.c** has the main function.
+
+To run simulation compile the ABPDdriver file - for example  
+
+```
+gcc -lm ABPDdriver.c
+```
+
+to get executable file and run the executable file with `./a.out`.  
+The simulation will create the file `tm_volts.xls` that contains the  
+time in first column and somatic voltage values in the second  
+column. The units are x-axis in milliseconds and y-axis in millivolts.  
+The output is the somatic voltage trace of the model during  
+spontaneous bursting:
+
+![screenshot](./screenshot.jpg)
+
+If you have any questions/comments please contact selvamaran@gmail.com.
+
+---
+
+2025-06-20: Converted README to Markdown.