Add RTC set example

Author: pennam

examples/BreakoutRTCSet/BreakoutRTCSet.ino

@@ -0,0 +1,28 @@
+/*
+  Breakout Carrier - BreakoutRTCSet
+
+  The sketch shows how to configure the RTC of the PortentaH7 using the Breakout Carrier.
+
+  The circuit:
+   - Portenta H7
+   - BreakOut Carrier
+   - CR2032 Battery
+
+  This example code is in the public domain.
+*/
+#include <Arduino_PortentaBreakoutCarrier.h>
+
+Timestamp utcTime;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+  // Configure UTC timestamp
+  utcTime.setFromUnixTimestamp(1618234648);
+  // Store the timestamp into the RTC
+  Breakout.RTClock.setTime(utcTime);
+}
+
+void loop() {
+    delay(1000);
+}