Update 'README.md'

README.md

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 # punchcardknittingexperiments
 
+experiment repo for knitting punch cards
+
+initial test.scad is by [Dr. Laura Taalman](https://mathgrrl.com/hacktastic/2019/05/punch-card-knitting-machine-patterns-with-openscad/). thx! 
+
+how to use:
+1. modify the "patterndata.scad" file (edit the 0's and 1's)
+2. open test.scad in openscad
+3. click [file] -> [export] -> [export as svg...]