added a single file script to convert .res files to .png files

README.md

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+# Convert .res files using PyCORN (adapted to work with pyinstaller)
+
+## Requirments
+
+* matplotlib
+
+## Features
+
+* convert_res.py is a modified PyCORN utility to generate .png plots from .res files
+* It does not accept any arguments;
+* When run converts every .res file in the same directory as the convert_res.py script.
+* Works with PyInstaller allowing convert_res.py to be bundled and easily distrubuted to people not familiar with terminal/console.
+
+## Example usage
+
+```
+python convert_res.py
+```
+
+## Known issues
+
+On macOS when creating an executable using PyInstaller an error related to tkinter may be issued. Please refer to this [link](https://github.com/pyinstaller/pyinstaller/issues/3753) for a solution.