add teensy demo example

examples/AS5600_demo_Teensy/AS5600_demo_Teensy.ino

@@ -0,0 +1,45 @@
+//
+//    FILE: AS5600_demo_Teensy.ino
+//  AUTHOR: Rob Tillaart, SquadQuiz
+// PURPOSE: demo
+// 
+//  tested compilation with Teensy 4.1
+
+#include "AS5600.h"
+#include "Wire.h"
+
+AS5600L as5600(AS5600_DEFAULT_ADDRESS);   //  use default Wire
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("AS5600_LIB_VERSION: ");
+  Serial.println(AS5600_LIB_VERSION);
+
+  Wire.begin();
+
+  as5600.begin(4);  //  set direction pin.
+  as5600.setDirection(AS5600_CLOCK_WISE);  //  default, just be explicit.
+  int b = as5600.isConnected();
+  Serial.print("Connect: ");
+  Serial.println(b);
+  delay(1000);
+}
+
+
+void loop()
+{
+  //  Serial.print(millis());
+  //  Serial.print("\t");
+  Serial.print(as5600.readAngle());
+  Serial.print("\t");
+  Serial.println(as5600.rawAngle());
+  //  Serial.println(as5600.rawAngle() * AS5600_RAW_TO_DEGREES);
+
+  delay(1000);
+}
+
+
+//  -- END OF FILE --