initial README.md

Author: nerdralph

README.md

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+# ArduinoShrink
+This library replaces Arduino AVR Core functions with smaller and faster versions.  
+For example, the Blink example sketch build for the Uno is 284 bytes smaller with ArduinoShrink.
+
+## Usage
+Select ArduinoShrink from the Sketch, Include Library menu.  This will replace pinMode, digitalWrite, and digitalRead with much smaller and faster versions.