New blog post (#48)

* New blog post

Adding a new introduction to pen plotting article

* punctuation updates

Co-authored-by: Brian Boucheron <brian@boucheron.org>

README.md

@@ -170,7 +170,8 @@ Single-line vector fonts or "engraving fonts".
 
 Blog posts, articles, tutorials, galleries, videos, et cetera.
 
-- [An Intro to Pen Plotters](https://medium.com/quarterstudio/an-intro-to-pen-plotters-29b6bd4327ba) - Good info on getting started with old HPGL plotters .
+- [An Intro to Pen Plotters](https://medium.com/quarterstudio/an-intro-to-pen-plotters-29b6bd4327ba) - Good info on getting started with old HPGL plotters.
+- [An Introduction to Pen Plotting](https://mrmrs.cc/writing/pen-plotting-intro/) - Another getting started article with modern pen plotters.
 - [Pen Plotter Programming: The Basics](https://medium.com/@fogleman/pen-plotter-programming-the-basics-ec0407ab5929) - Some basics of programming vector paths, including sorting, joining, and simplifying.
 - [On Generative Algorithms](https://inconvergent.net/generative) - Nice 13-part walkthrough of interesting algorithms.
 - [Roland DG DXY-990](https://hackaday.io/project/12276-roland-dg-dxy-990) - Quickstart guide for a Roland flatbed plotter.