Added Chrono::Duration examples

examples/01_Basic/UsingChronoDurations1/UsingChronoDurations1.ino

@@ -0,0 +1,27 @@
+#include "TeensyTimerTool.h"
+using namespace TeensyTimerTool;
+
+PeriodicTimer t1(TCK);
+PeriodicTimer t2(TCK);
+
+void isr1()
+{
+    Serial.printf("called @: %u ms\n", millis());
+}
+
+void isr2()
+{
+    digitalToggleFast(LED_BUILTIN);
+}
+
+void setup()
+{
+    pinMode(LED_BUILTIN, OUTPUT);
+
+    t1.begin(isr1, 5.02s);  // instead of 5020000
+    t2.begin(isr2, 25ms);   // instead of   25000
+}
+
+void loop()
+{
+}

examples/01_Basic/UsingChronoDurations2/UsingChronoDurations2.ino

@@ -0,0 +1,30 @@
+#include "TeensyTimerTool.h"
+using namespace TeensyTimerTool;
+
+OneShotTimer timer[]{TCK, TCK, TCK, TCK}; // 5 one-shot-timers
+unsigned t_0;                             // start time
+
+void isr()
+{
+    Serial.printf("called @: %u ms\n", millis() - t_0);
+}
+
+void setup()
+{
+    while (!Serial) {}            // wait for PC to connect the virtual serial port
+
+    for (OneShotTimer& t : timer) // for the sake of simplicity, attach the same isr to all timers in array
+    {
+        t.begin(isr);
+    }
+
+    timer[0].trigger(10ms);                                  // 10 ms
+    timer[1].trigger(0.5s + 10ms);                           // 510 ms
+    timer[2].trigger(2.5 * 0.3s + 20'000us / 2);             // 760 ms
+    timer[3].trigger(milliseconds(50) + microseconds(5000)); // 55ms
+    t_0 = millis();
+}
+
+void loop()
+{
+}