Update README.md

Add Windows specific instructions

README.md

@@ -27,6 +27,19 @@ Program [Nordic Semiconductor](https://www.nordicsemi.com) nR5 based boards with
  3. Create the following folder: ```hardware/nRF5``` and change directories to it
  4. Clone this repo: ```git clone https://github.com/sandeepmistry/arduino-nRF5.git nRF5```
 
+## OS Specific Setup
+
+###  Windows
+
+#### Driver Setup for Segger J-Link
+
+ 1. Download [Zadig](http://zadig.akeo.ie)
+ 2. Plugin Segger J-Link or DK board
+ 3. Start ```Zadig```
+ 4. Select ```Options -> List All Devices```
+ 5. Select ```J-Link (Interface 2)``` from the device dropdown
+ 6. Click ```Replace Driver```
+
 ## Credits
 
 This core is based on the [Arduino SAMD Core](https://github.com/arduino/ArduinoCore-samd) and licensed under the same [GPL License](LICENSE)