Add README for the example project.

example/README

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+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is a small example program using libopenstm32.
+
+It's intended for the ST STM32-based Olimex STM32-H103 eval board (see
+http://olimex.com/dev/stm32-h103.html for details). It should blink
+the LED on the board.
+
+
+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 on the STM32-H103 board using OpenOCD:
+
+ $ openocd -f /usr/share/openocd/scripts/interface/jtagkey-tiny.cfg \
+           -f /usr/share/openocd/scripts/olimex_stm32_h103.cfg
+ $ telnet localhost 4444
+ > init
+ > reset halt
+ > flash write_image erase blink.bin 0x08000000
+ > resume 0x08000000
+