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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diff --git a/docs/library/zephyr.DiskAccess.rst b/docs/library/zephyr.DiskAccess.rst
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+.. currentmodule:: zephyr
+.. _zephyr.DiskAccess:
+
+class DiskAccess -- access to disk storage
+==========================================
+
+Uses `Zephyr Disk Access API <https://docs.zephyrproject.org/latest/reference/storage/disk/access.html>`_.
+
+This class allows access to storage devices on the board, such as support for SD card controllers and
+interfacing with SD cards via SPI. Disk devices are automatically detected and initialized on boot using
+Zephyr devicetree data.
+
+The Zephyr disk access class enables the transfer of data between a disk device and an accessible memory buffer given a disk name,
+buffer, starting disk block, and number of sectors to read. MicroPython reads as many blocks as necessary to fill the buffer, so
+the number of sectors to read is found by dividing the buffer length by block size of the disk.
+
+Constructors
+------------
+
+.. class:: DiskAccess(disk_name)
+
+   Gets an object for accessing disk memory of the specific disk.
+   For accessing an SD card on the mimxrt1050_evk, ``disk_name`` would be ``SDHC``. See board documentation and
+   devicetree for usable disk names for your board (ex. RT boards use style USDHC#).
+
+Methods
+-------
+
+.. method:: DiskAccess.readblocks(block_num, buf)
+            DiskAccess.readblocks(block_num, buf, offset)
+.. method:: DiskAccess.writeblocks(block_num, buf)
+            DiskAccess.writeblocks(block_num, buf, offset)
+.. method:: DiskAccess.ioctl(cmd, arg)
+
+    These methods implement the simple and extended
+    :ref:`block protocol <block-device-interface>` defined by
+    :class:`uos.AbstractBlockDev`.
+