ext/hal: Add WINC1500 README for non-Apache 2.0 licensed contribution

Atmel ASF is BSD-3-Clause

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

ext/hal/atmel/asf/common/components/wifi/README

@@ -0,0 +1,55 @@
+Atmel WINC1500 HAL
+##################
+
+Origin:
+   Extracted from Atmel ASF - Advanced Software Framework
+   Embedded Software Solution for Atmel Flash MCUs
+
+   Took the generic winc1500 code in ASF directory:
+   common/components/wifi/winc1500
+
+   http://asf.atmel.com/docs/latest/download.html
+
+Status:
+   3.35
+
+Purpose:
+   Drive Atmel WINC1500 offloaded WiFi chip.
+
+Description:
+   In order to support WINC1500 chip, it has been decided to use the
+   existing Atmel't HAL: ASF. WINC1500 is an MCU providing WiFi and
+   an IPv4 stack. These features appear then fully offloaded from Zephyr
+   into that chip.
+
+   Provides an acces to WiFi networks.
+
+   Zephyr does not own a native WiFi stack, however enabling Zephyr to
+   access WiFi networks is critical and using such offloaded MCU is the
+   easiest way to achieve this goal.
+
+   WINC1500 is fairly easy to interface with, it proposes either SPI or
+   I²C bus to do so.
+
+Dependencies:
+   None.
+
+   No direct dependancy. Zephyr will see the MCU as a usual network
+   interface. Such object being instanciated by the driver, which in turn
+   accesses the chip through Atmel ASF HAL.
+
+URL:
+   http://asf.atmel.com/docs/latest/download.html
+
+commit:
+   772047b391345f276237d1b340055045d18c3844
+
+Maintained-by:
+   External
+
+License:
+   BSD-3-Clause
+
+License Link:
+   See last page of Release notes found at:
+   http://www.microchip.com/avr-support/advanced-software-framework-(asf)