docs: add Arduino 101 board documentation

Change-Id: I5f0cab8ece3544d14cf328de918f8d076328b859
Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

boards/arc/arduino_101_sss/doc/board.rst

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+.. _arduino_101_sss:
+
+Arduino/Genuino 101 (Sensor Subsystem)
+######################################
+
+The Arduino 101 contains a 32 MHz Argonaut RISC Core (ARC)* EM processor as part
+of the Quark SE C1000 SoC within the Curie module.
+The ARC core is referenced as the digital signal processor (DSP) sensor hub or a
+sensor subsystem depending on what document you’re looking at.
+
+For more information about using the sensor subsystem with Zephyr, see
+:ref:`arduino_101`.
+

boards/arm/arduino_101_ble/doc/board.rst

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+.. _arduino_101_ble:
+
+Arduino/Genuino 101 (BLE)
+#########################
+
+The Arduino 101* (branded Genuino 101* outside the U.S.) board includes on-board
+Bluetooth LE to enable developers to interact with Bluetooth enabled devices
+such as phones and tablets.
+
+See :ref:`arduino_101` for information how to use the BLE module on the Arduino
+101 with Zephyr.
+