Added example for BH1750 lux sensor

libraries/BH1750/README.md

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+BH1750
+======
+
+An Arduino library for digital light sensor breakout boards containing the BH1750FVI IC.
+
+The board uses I2C for communication. 
+
+2 pins are required to interface to the device.
+
+Datasheet for the light sensor:
+http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
+
+
+To download, click the ZIP button above. Extract the zip file and  rename the uncompressed folder to BH1750. Check that it contains  BH1750.cpp and BH1750.h, keywords.txt.
+
+Place the BH1750 library folder your <arduinosketchfolder>/libraries/ folder. Restart the IDE.
+
+
+Example usage:
+```c
+/*
+
+Example of BH1750 library usage.
+
+This example initalises the BH1750 object using the default
+high resolution mode and then makes a light level reading every second.
+
+Connection:
+ VCC-5v
+ GND-GND
+ SCL-SCL(analog pin 5)
+ SDA-SDA(analog pin 4)
+ ADD-NC or GND
+
+*/
+
+#include <Wire.h>
+#include <BH1750.h>
+
+
+BH1750 lightMeter;
+
+
+void setup(){
+  Serial.begin(9600);
+  lightMeter.begin();
+  Serial.println("Running...");
+}
+
+
+void loop() {
+  uint16_t lux = lightMeter.readLightLevel();
+  Serial.print("Light: ");
+  Serial.print(lux);
+  Serial.println(" lx");
+  delay(1000);
+}
+```