Update README.txt

rtek1000 · Apr 23, 2022 · 15da782 · 15da782
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commit 15da782
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diff --git a/README.txt b/README.txt
@@ -15,3 +15,5 @@ See too:
    https://github.com/br3ttb/Arduino-PID-AutoTune-Library
 
    http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/
+
+   https://playground.arduino.cc/Code/PIDAutotuneLibrary/