Submission for Turtle Graphics library

Author: quarks

src/content/libraries/en/TurtleGraphics.yaml

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+name: TurtleGraphics
+description: Watch images being drawn using turtle graphics.
+category: drawing
+sourceUrl: https://github.com/quarks/turtle-graphics
+websiteUrl: http://www.lagers.org.uk/tg/index.html
+author:
+  name: Peter Lager
+  url: http://www.lagers.org.uk
+featuredImage: ../images/turtle-graphics.jpg
+featuredImageAlt: Poster showing some of the graphics that can be drawn with this library
+license: MIT