Add logo to README.md

Author: RowDaBoat

README.md

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 # Kobold Parsing Kit
 
+<img src="kobold-parsing-kit-logo.png" width="256" height="256">
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 [![Test and Publish](https://github.com/RowDaBoat/kobold-parsing-kit/actions/workflows/ci.yml/badge.svg)](https://github.com/RowDaBoat/kobold-parsing-kit/actions/workflows/ci.yml)
 
 The **Kobold Parsing Kit** is a set of tools designed to create parsers using grammars expressed in a simple domain specific language. No regular expressions, just an easy to learn DSL.