Added example

examples/DigiSpark_PWM_example/DigiSpark_PWM_example.ino

@@ -0,0 +1,27 @@
+/* DigiSpark_PWM Library
+   soylentOrange - https://github.com/soylentOrange/DigiSpark_PWM
+*/
+
+#include "DigiSpark_PWM.h"  // https://github.com/soylentOrange/DigiSpark_PWM
+
+uint8_t g_dutyCycle;   // DC in %
+uint32_t g_frequency;  // frequency in Hz
+
+// Cretae instance of DigiSpark_PWM-class, connected to Pin-PB1
+// (This Pin is connected to the onboard LED)
+DigiSpark_PWM pwm = DigiSpark_PWM(PIN_PB1);
+
+// For connecting to Pin PB4 simply use:
+// DigiSpark_PWM pwm = DigiSpark_PWM();
+
+// begin PWM-output
+void setup() {
+  // initialize and start PWM-output @1Hz with 50% duty-cycle
+  g_frequency = 1;   // 1Hz
+  g_dutyCycle = 50;  // 50%
+  pwm.begin(g_frequency, g_dutyCycle);
+}
+
+void loop() {
+  // nothing to do here, the LED will blink driven by the hardware PWM
+}