add LowPowerTicker examples (#79)

Author: maciejbocianski

APIs_Drivers/lowpowerTicker_ex_1/README.md

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+# LowpowerTicker example
+
+This example shows how to use the LowpowerTicker to cause periodic events, like blinking an LED on and Off at a certain rate. In this example LED1 is controlled by the main while loop, while LED2 is controlled by the Ticker callback function.
+

APIs_Drivers/lowpowerTicker_ex_1/main.cpp

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+/*
+ * Copyright (c) 2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+LowPowerTicker flipper;
+DigitalOut led1(LED1);
+
+void flip()
+{
+    led1 = !led1;
+}
+
+int main()
+{
+    led1 = 1;
+    flipper.attach(&flip, 2.0); // the address of the function to be attached (flip) and the interval (2 seconds)
+
+    while (1) {
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/lowpowerTimeout_ex_1/README.md

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+# LowpowerTimout example
+
+This example shows how to use a LowpowerTimout to schedule delayed events. The LowPowerTimeout API is a countdown timer that triggers a callback function when the timer runs out. The LowPowerTimeout interface can be though of as a one shot LowPowerTicker.
+

APIs_Drivers/lowpowerTimeout_ex_1/main.cpp

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+/*
+ * Copyright (c) 2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+LowPowerTimeout flipper;
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+
+void flip()
+{
+    led2 = !led2;
+}
+
+int main()
+{
+    led2 = 1;
+    flipper.attach(&flip, 2.0); // setup flipper to call flip after 2 seconds
+
+    // spin in a main loop. flipper will interrupt it to call flip
+    while (1) {
+        led1 = !led1;
+        ThisThread::sleep_for(200);
+    }
+}

APIs_Drivers/lowpowerTimer_ex_1/README.md

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+# LowpowerTimer example
+
+This example shows how to use a LowpowerTimer to measure time. The time will be the amount of time between when the start() and stop() functions are run. The Timer class counts from 0 up.
+

APIs_Drivers/lowpowerTimer_ex_1/main.cpp

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+/*
+ * Copyright (c) 2020 Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+LowPowerTimer t;
+
+int main()
+{
+    t.start();
+    printf("Hello World!\n");
+    t.stop();
+    printf("The time taken was %f seconds\n", t.read());
+}