added I2C control function (Original program cannot handle I2C constructor)

Dependencies:   TextLCD X_NUCLEO_53L0A1

Fork of HelloWorld_53L0A1 by ST

Revision:
13:5a59de800135
diff -r e9dedf2d2560 -r 5a59de800135 TextLCD.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Tue Feb 06 10:14:16 2018 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/wim/code/TextLCD/#111ca62e8a59