Update README.md

Author: bohnacker

README.md

@@ -1,2 +1,7 @@
 # p5js-screenPosition
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 This function provides a solution to the missing screenX and screenY functions in p5.js. See https://github.com/processing/p5.js/issues/1553 for the discussion. 
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+**This is work in progress.** 
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+I'm aware of some missing stuff like tracking resetMatrix() and applyMatrix() in 2d-mode.