Added connector info

README.md

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+# Raspberry PI Zero RAK831 Lora Gateway Shield
+
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK831-finished.jpg" alt="Full">     
+
+This shield has been created to help wiring between Raspberry PI Zero and [RAK831][10] LoraWan concentrator Gateway and to be able to put the whole thing into a enclosure..
+
+Then I decided to add some funky stuff like:
+
+## Features (tested, working fine)
+
+ - Push button on GPIO17 to be able to shutdown PI Locally
+ - Added FTDI connector to be able to take hand on PI console when in enclosure (lost network or whatever, no more need to get all off the enclosure and connect HDMI cable to see what's going on)
+ - Added footprint for excellent Murata OKI-78SR-5 DC/DC 5V
+ - Footprint for [RAK831][10] LoraWan concentrator (main goal)
+ - I2C connectors to be able to add internal/external sensors or OLED such as BME280, SI7021, HTU21D SSD1306
+ - Power with terminal block
+ - 2 visual WS2812B Leds
+ - Easy to build and solder, 0805 or PTH components
+ - Holes to fix board on enclosure or other support
+ - quick fix connector, you can plug/unplug PI Zero without soldering
+
+## Detailed Description
+
+No specific documentation for now, it's just a kind of wiring helper, please see Gateway section on [TTN Wiki][13] and also on [TTN Forums][14] for more information on these gateways.
+
+You can power the board with 5V going to Raspberry PI USB power directly, in this case use a descent power supply.
+You can also use "basic" POE with injector and splitter, this is what I do to oustide (I inject 12V) and use the Murata DC/DC Step down to 5V (in this case cut the trace on bottom side of PCB)
+
+## Software Installation
+
+Please follow the installation documented on the dedicated [repo][5]
+
+
+## Schematics
+
+![schematic](https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK-sch.png)  
+
+## Boards 
+
+### PCB 
+
+**Top side**
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK-top.jpg" alt="PCB Top">    
+
+**Bottom side**
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zeroo/master/pictures/PiZero-RAK-bot.jpg" alt="PCB Bottom">    
+
+### Assembled PCB 
+
+**Top side**
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK-top-assembled.jpg" alt="PCB Top Assembled">    
+
+**Bottom side**
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK-bot-assembled.jpg" alt="PCB Bottom Assembled">    
+
+You can order the PCB of this board at [PCBs.io][3].
+PCBs.io give me some reward when you order my designed boards from their site. This is pretty good, because I can use these rewards to create and design new boards and order boards for a discounted price, so if you don't care about PCB manufacturer please use PCBs.io.
+
+## Assembled boards into nice enclosure 
+
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK831-case.jpg" alt="Fully assembled and in nice enclosure with sensors">     
+
+With the samtec connector you can put the PI Zero on top or bottom, depending on your choice, just solder the sametec connector to the PCB side you need.
+<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK831-shielded.jpg" alt="Fully assembled and in nice enclosure with sensors">     
+
+
+## Bill Of Material
+
+Nothing fancy, all components are 0805 and/or PTH and can be ordered almost anywhere (digikey, mouser, radiospare, ...). 
+use only what you need dependings on what you want to do. You can find lot of components on ebay or aliexpress, but since vendors are often ephemere, I put for reference the BOM on well known providers.
+
+Here is the [octopart BOM](https://octopart.com/bom-tool/SJPhS5Am)
+
+If you have good reference for standoff like [this][44], just let me know.
+
+## License
+
+<img alt="Creative Commons Attribution-NonCommercial 4.0" src="https://i.creativecommons.org/l/by-nc/4.0/88x31.png">   
+
+This work is licensed under a [Creative Commons Attribution-NonCommercial 4.0 International License](http://creativecommons.org/licenses/by-nc/4.0/)    
+If you want to do commercial stuff with this project, please contact [CH2i company](https://www.ch2i.eu/en#support) so we can organize an simple agreement.
+
+# Misc
+
+See news and other projects on my [blog][1] 
+
+[1]: https://hallard.me
+[3]: https://PCBs.io/share/rpqDd
+
+[5]: https://github.com/ch2i/LoraGW-Setup
+[10]: http://www.rakwireless.com/en/WisKeyOSH/RAK831
+[44]: https://www.ebay.com/itm/162036913864?var=461005633671
+[45]: http://www2.mouser.com/ProductDetail/Murata-Power-Solutions/OKI-78SR-5-15-W36H-C/?qs=sGAEpiMZZMt6Q9lZSPl3Rb6uckMsyldgZf%2f4GdkUxM8%3d
+