Add some merkur-board docs

even though it doesn't flash contiki yet.

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+# 6LowPAN with the Merkur-Board
+
+In for the [[rpi6lowpan]] to be actually usefull it needs to talk to
+some sensors. The [Merkur Board][0] is open hardware:
+
+[[!img merkur-board.jpg size="x150" alt="Merkur-Board"]]
+
+It has digital outputs as well as digital, analog and PWM outputs and
+supports attaching Arduino Grove Modules which should make experiments
+simple.  In order to test thinks I use the
+[Plant Oberservation Kit][1] set.
+
+One uses USB-Serial converter to flash the device. Details on how to
+connect it are [here][2]. Once the converter is attached to the board
+it's LED starts to blink (in my case 4 times short, one time long).
+
+Once flushed the board can be run on [battery power][3].
+
+* [Details on the different pinouts][4]
+* [Details on how to flash the device][5] with avrdude
+* The plant moisture sensor connects to [A5][6]
+
+But currently when trying the flash the merkur-board I'm only seeing
+
+	$ cd osd-contiki/examples/osd/arduino-plantobserving
+	$ ./flash.sh /dev/ttyUSB4
+	INFO: compiling with CoAP-13
+	avrdude -pm128rfa1 -c arduino -P/dev/ttyUSB4 -b57600 -e -U \
+    flash:w:arduino-example.osd-merkur.hex:a -U \
+    eeprom:w:arduino-example.osd-merkur.eep:a
+	avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x72
+	avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x6c
+	avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xc0
+	avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x72
+	avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x6c
+	avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xc0
+	avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x72
+	avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x6c
+	avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x72
+	avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x6c
+
+	avrdude done.  Thank you.
+
+	Makefile:88: recipe for target 'flash' failed
+	make: *** [flash] Error 1
+
+even if I [ground the reset pin][7] (Pin 3).
+
+
+[0]: http://osdwiki.open-entry.com/doku.php/de:projekte:merkur
+[1]: http://osdwiki.open-entry.com/doku.php/de:projekte:plant_observation_kit
+[2]: http://osdwiki.open-entry.com/doku.php/de:tutorials:first_steps_arduino_ide
+[3]: http://osdwiki.open-entry.com/lib/exe/detail.php/de:ideen:merkurknoten.jpg?id=de%3Aideen%3Afirststepsmerkurboard
+[4]: http://osdwiki.open-entry.com/doku.php/de:projekte:merkur#pinouts
+[5]: http://osdwiki.open-entry.com/doku.php/en:projekte:bootloader?s[]=flash
+[6]: http://osdwiki.open-entry.com/doku.php/de:products:merkur_grove_board_4#steckerbelegung
+[7]: http://www.meetup.com/IoT-Vienna/events/181968432/
+[Prolific Pinout]: https://jethomson.files.wordpress.com/2010/02/ca-42_dku-5_pinout.jpg