added parkdown logo

README.md

@@ -1,7 +1,7 @@
 # Parkdown
-– a simple recursive descent Markdown parser for PHP
+– a simple recursive descent Markdown parser for PHP *(version >= 8.1)*
 
-![Markdown is a simple markup language](https://upload.wikimedia.org/wikipedia/commons/4/48/Markdown-mark.svg)
+![Markdown is a simple markup language](./docs/logo_parkdown.svg)
 
 ## Specification
 

docs/logo_parkdown.svg

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 26.0.3, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Ebene_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 189.6 128" style="enable-background:new 0 0 189.6 128;" xml:space="preserve" width="189" height="128">
+<g>
+	<g>
+		<path d="M175.7,0.2H14.1C6.4,0.2,0.2,6.9,0.2,15v98c0,8.1,6.2,14.8,13.8,14.8h161.7c7.6,0,13.8-6.6,13.8-14.8V15
+			C189.6,6.9,183.4,0.2,175.7,0.2z M180.1,113c0,2.9-1.9,5.2-4.3,5.2H14.1c-2.4,0-4.3-2.3-4.3-5.2V15c0-2.9,1.9-5.2,4.3-5.2h161.7
+			c2.4,0,4.3,2.3,4.3,5.2V113z M142.2,30h-20v35h-20l30,33l30-33h-20V30z M62.3,30H27.3v68h21.1V72.8h11.5c8.5,0,14.8-1.9,18.9-5.8
+			S85,57.7,85,50.9c0-6.7-1.9-11.8-5.7-15.4C75.6,31.8,69.9,30,62.3,30z M62.1,56.9c-1.6,1.4-4.5,2.1-8.5,2.1h-5.1V43.8h6
+			c3.9,0,6.6,0.7,8,2.2s2.1,3.3,2.1,5.4C64.6,53.7,63.8,55.5,62.1,56.9z"/>
+	</g>
+</g>
+</svg>