Add i2c_stts75_sensor example.

Thanks Thomas Otto <tommi@viadmin.org> for the patch!

examples/other/i2c_stts75_sensor/README

@@ -0,0 +1,49 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program sends some characters on USART1.
+Afterwards it connects to an STTS75 sensor (ST LM75 compatible)
+at adress A0/1/2=0 and sets reverse polarity, 26 degree Tos and Thyst.
+It reads out the temperature and submits the temperature over USART1 in
+binary format (ASCII 0/1).
+
+The terminal settings for the receiving device/PC are 115200 8n1.
+
+
+Building
+--------
+
+ $ make
+
+Running 'make' on the top-level libopenstm32 directory will automatically
+also build this example. Or you can build the library "manually" and
+then run 'make' in this directory.
+
+You may want to override the toolchain (e.g., arm-elf or arm-none-eabi):
+
+ $ PREFIX=arm-none-eabi make
+
+For a more verbose build you can use
+
+ $ make V=1
+
+
+Flashing
+--------
+
+You can flash the generated code using OpenOCD:
+
+ $ make flash
+
+Or you can do the same manually via:
+
+ $ openocd -f interface/jtagkey-tiny.cfg -f target/stm32.cfg
+ $ telnet localhost 4444
+ > reset halt
+ > flash write_image erase i2c_stts75_sensor.hex
+ > reset
+
+Replace the "jtagkey-tiny.cfg" with whatever JTAG device you are using, and/or
+replace "stm.cfg" with your respective config file.
+