Add OLED documentation.

docs/Display.md

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+# Display
+
+Cleanflight supports displays to provide information to you about your aircraft and cleanflight state.
+
+##Supported Hardware
+
+At this time no other displays are supported other than the SSD1306 / UG-2864HSWEG01.
+
+### SSD1306 OLED displays
+
+The SSD1306 display is a 128x64 OLED display that is visible in full sunlight, small and consumes very little current.  
+This makes it ideal for aircraft use.
+
+There are various models of SSD1306 boards out there, they are not all equal and some require addtional modifications
+before they work.  Choose wisely!
+
+Links to screens:
+
+http://www.banggood.com/0_96-Inch-I2C-IIC-SPI-Serial-128-X-64-OLED-LCD-LED-Display-Module-p-922246.html
+http://www.wide.hk/products.php?product=I2C-0.96%22-OLED-display-module-%28-compatible-Arduino-%29
+http://witespyquad.gostorego.com/accessories/readytofly-1-oled-128x64-pid-tuning-display-i2c.html
+http://www.multiwiicopter.com/products/1-oled
+
+The banggood.com screen is the cheapest at the time fo writing and will correctly send I2C ACK signals.
+
+#### Crius CO-16
+
+This screen is best avoided but will work if you modify it.
+
+Step 1
+
+As supplied the I2C ack signal is not sent because the manufacturer did not bridge D1 and D2 together.  To fix this solder
+the two pins together as they enter the screen.  Failure to do this will result is a screen that doesn't display anything.
+
+Step 2
+
+Pin 14 must be disconnected from the main board using a scalpel. Then connect a 10nF or 100nF capacitor between pins 30 and the
+lifted pin 14.
+
+Step 3
+
+Connect a 100K resistor between Pin 9 and the lifted Pin 14.
+
+Failure to perform steps 2 and 3 will result in a display that only works on power up some of the time any may display random dots
+or other display corruption.
+
+More can be read about this procedure here: http://www.multiwii.com/forum/viewtopic.php?f=6&t=2705&start=10
+
+There are diagrams in the Wiring directory.
+
+## Connections
+
+Connect +5v, Ground, I2C SDA and I2C SCL from the flight controller to the display.
+
+
+