Update README.md

Author: MyNameIsTrez

README.md

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-# Cortex Command Mod Converter Engine
+<p align="center"><img src="https://github.com/cortex-command-community/Cortex-Command-Legacy-Mod-Converter/blob/master/Media/legacy-mod-converter-icon.png" alt="Cortex Command Mod Converter Engine icon"></p>
+<h1 align="center">Cortex Command Mod Converter Engine</h1>
 
 A library for automatically converting mods to the latest version of the [Cortex Command Community Project](https://github.com/cortex-command-community/Cortex-Command-Community-Project).