docs/library/zephyr: Add libraries specific to the Zephyr port.

Includes documentation for Zephyr specific modules (zephyr and zsensor),
classes (DiskAccess and FlashArea), and functions.

Signed-off-by: Julia Hathaway <julia.hathaway@nxp.com>

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+.. currentmodule:: zsensor
+
+:mod:`zsensor` --- Zephyr sensor bindings
+=========================================
+
+.. module:: zsensor
+    :synopsis: zephyr sensor bindings
+
+The ``zsensor`` module contains a class for using sensors with Zephyr.
+
+.. _zsensor.Sensor:
+
+class Sensor --- sensor control for the Zephyr port
+---------------------------------------------------
+
+Use this class to access data from sensors on your board.
+See Zephyr documentation for sensor usage here: `Sensors
+<https://docs.zephyrproject.org/latest/reference/peripherals/sensor.html?highlight=sensor#sensors>`_.
+
+Sensors are defined in the Zephyr devicetree for each board. The quantities that a given sensor can
+measure are called a sensor channels. Sensors can have multiple channels to represent different axes
+of one property or different properties a sensor can measure. See `Channels`_ below for defined sensor
+channels.
+
+Constructor
+~~~~~~~~~~~
+
+.. class:: Sensor(device_name)
+
+    Device names are defined in the devicetree for your board.
+    For example, the device name for the accelerometer in the FRDM-k64f board is "FXOS8700".
+
+Methods
+~~~~~~~
+
+.. method:: Sensor.measure()
+
+    Obtains a measurement sample from the sensor device using Zephyr sensor_sample_fetch and
+    stores it in an internal driver buffer as a useful value, a pair of (integer part of value,
+    fractional part of value in 1-millionths).
+    Returns none if successful or OSError value if failure.
+
+.. method:: Sensor.get_float(sensor_channel)
+
+    Returns the value of the sensor measurement sample as a float.
+
+.. method:: Sensor.get_micros(sensor_channel)
+
+    Returns the value of the sensor measurement sample in millionths.
+    (Ex. value of ``(1, 500000)`` returns as ``1500000``)
+
+.. method:: Sensor.get_millis(sensor_channel)
+
+    Returns the value of sensor measurement sample in thousandths.
+    (Ex. value of ``(1, 500000)`` returns as ``1500``)
+
+.. method:: Sensor.get_int(sensor_channel)
+
+    Returns only the integer value of the measurement sample.
+    (Ex. value of ``(1, 500000)`` returns as ``1``)
+
+Channels
+~~~~~~~~
+
+.. data:: ACCEL_X
+
+    Acceleration on the X axis, in m/s^2.
+
+.. data:: ACCEL_Y
+
+    Acceleration on the Y axis, in m/s^2.
+
+.. data:: ACCEL_Z
+
+    Acceleration on the Z axis, in m/s^2.
+
+.. data:: GYRO_X
+
+    Angular velocity around the X axis, in radians/s.
+
+.. data:: GYRO_Y
+
+    Angular velocity around the Y axis, in radians/s.
+
+.. data:: GYRO_Z
+
+    Angular velocity around the Z axis, in radians/s.
+
+.. data:: MAGN_X
+
+    Magnetic field on the X axis, in Gauss.
+
+.. data:: MAGN_Y
+
+    Magnetic field on the Y axis, in Gauss.
+
+.. data:: MAGN_Z
+
+    Magnetic field on the Z axis, in Gauss.
+
+.. data:: DIE_TEMP
+
+    Device die temperature in degrees Celsius.
+
+.. data:: PRESS
+
+    Pressure in kilopascal.
+
+.. data:: PROX
+
+    Proximity. Dimensionless. A value of 1 indicates that an object is close.
+
+.. data:: HUMIDITY
+
+    Humidity, in percent.
+
+.. data:: LIGHT
+
+    Illuminance in visible spectrum, in lux.
+
+.. data:: ALTITUDE
+
+    Altitude, in meters.