pw_bytes: Module for bytes manipulation.

Added a ByteBuffer module which contains a collection of utilities for
manipulating binary data.

Change-Id: Ia071c3e68a1ada63232fcb56f3d2d8171bac0778

pw_bytes/docs.rst

diff --git a/pw_bytes/docs.rst b/pw_bytes/docs.rst
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+.. _chapter-pw-bytes:
+
+.. default-domain:: cpp
+
+.. highlight:: sh
+
+---------
+pw_bytes
+---------
+pw_bytes is a collection of utilities for manipulating binary data.
+
+Compatibility
+=============
+C++17
+
+Dependencies
+============
+* ``pw_preprocessor``
+* ``pw_status``
+* ``pw_span``
+
+Features
+========
+
+pw::ByteBuilder
+-----------------
+ByteBuilder is a utility class which facilitates the creation and
+building of formatted bytes in a fixed-size buffer.
+
+Future work
+^^^^^^^^^^^
+* Adding Endianness