NXP PCT2075 temperature sensor driver for mbed

Diff: README.md

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+NXP PCT2075 temperature sensor driver for mbed
+==============================================
+
+This library is a driver for the [NXP PCT2075](http://www.nxp.com/products/sensors/i2c-temperature-voltage-monitors/ic-bus-fm-plus-1-degree-c-accuracy-digital-temperature-sensor-and-thermal-watchdog:PCT2075).
+It only handles the I2C communication with the sensor, it does not handle the OS
+interupt line. The [mbed InterruptIn](https://developer.mbed.org/handbook/InterruptIn) library can be used for this.
+
+Example usage:
+
+```
+#include <mbed.h>
+#include <PCT2075.h>
+
+Serial s(USBTX, USBRX); // tx, rx
+
+InterruptIn TempPinInt(PC4);
+LowPowerTicker ticker;
+
+static volatile bool temp_int = false;
+static volatile bool tick_int = false;
+
+int main( void )
+{
+    TempPinInt.mode(PullUp);
+
+    PCT2075::Configuration config = {
+        PCT2075::OS_FAULT_QUE_1,
+        PCT2075::OS_ACTIVE_LOW,
+        PCT2075::OS_MODE_INTERRUPT,
+        PCT2075::DEVICE_MODE_SHUTDOWN
+    };
+    temp_sensor.set_configuration(config);
+    temp_sensor.set_idle_time(PCT2075::TIDLE_MAX);
+    
+    temp_sensor.set_hyst_temperature(2000);
+    temp_sensor.set_os_temperature(2500);
+    
+    TempPinInt.fall(&on_fall);
+    ticker.attach(&tick, 2.0);
+
+    while(true) {
+        sleep(); // wait to be woken up by ticker or temp sensor
+
+        if (tick_int) {
+            s.printf("Tick\r\n");
+            config.device_mode = PCT2075::DEVICE_MODE_NORMAL;
+            temp_sensor.set_configuration(config);
+            tick_int = false;
+        }
+
+        if (temp_int) {
+            config.device_mode = PCT2075::DEVICE_MODE_SHUTDOWN;
+            temp_sensor.set_configuration(config);
+            uint16_t t = temp_sensor.read_temperature();
+            s.printf("Temperature: %d\r\n", t);
+            temp_int = false;
+        }
+    }
+}
+
+```