Reorganizing library structure, prep for 2.0.0

drivers/AVR/DigitalIO/examples/testArduino/testArduino.ino

@@ -0,0 +1,14 @@
+// Scope test for write timing with Arduino digitaWrite().
+const uint8_t PIN13 = 13;
+
+void setup() {
+  // Set mode to OUTPUT.
+  pinMode(PIN13, OUTPUT);
+}
+void loop() {
+  digitalWrite(PIN13, HIGH);
+  digitalWrite(PIN13, LOW);
+  digitalWrite(PIN13, HIGH);
+  digitalWrite(PIN13, LOW);
+  delay(1);
+}