Add libraries dir

libraries/LiquidCrystal_I2C-master/examples/HelloWorld/HelloWorld.pde

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+//YWROBOT
+//Compatible with the Arduino IDE 1.0
+//Library version:1.1
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
+
+void setup()
+{
+  lcd.init();                      // initialize the lcd 
+  // Print a message to the LCD.
+  lcd.backlight();
+  lcd.setCursor(3,0);
+  lcd.print("Hello, world!");
+  lcd.setCursor(2,1);
+  lcd.print("Ywrobot Arduino!");
+   lcd.setCursor(0,2);
+  lcd.print("Arduino LCM IIC 2004");
+   lcd.setCursor(2,3);
+  lcd.print("Power By Ec-yuan!");
+}
+
+
+void loop()
+{
+}