doc: Add documentation for arraydump

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diff --git a/doc/src/tools/arraydump.rst b/doc/src/tools/arraydump.rst
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+arraydump
+=========
+
+`arraydump` is a utility to create hexdumps in different forms, suitable for
+comsumption by a C/C++ compiler. The tool is inspired by the well-known `xxd`
+utility which is part of `vim`. We created `arraydump` to overcome some
+weaknesses of `xxd`.
+
+Advantages of arraydump over xxd
+--------------------------------
+
+`arraydump` provides the following advantages over `xxd`:
+
+1. Element type selection:
+   `arraydump` allows you to specify the element-type of the array that will be
+   generated. The currently supported types are ``std::int8_t`` (via `--type
+   int8`), ``std::uint8_t`` (via `--type uint8`), ``char`` (via `--type char`),
+   ``signed char`` (via `--type schar`), and ``unsigned char`` (via `--type
+   uchar`).
+
+2. Use ``std::array<T, S>`` instead of C-Style arrays:
+   Since ``xxd`` was designed to work for **C** projects, it makes use of plain,
+   old, C-Style arrays. ``arraydump`` has been designed for **C++** projects,
+   and one of the decisions made during development was to use modern facilities
+   in order to promote usage modern **C++**.
+
+3. Support for processing multiple files at once:
+   `arraydump` allows you to transform multiple files at once. You can specify a
+   list of files and a directory for the generated files (via `--output <dir>`).
+   This makes it easy and fast to transform a lot of files at once without
+   having to resort to shell scripting magic.
+
+Disadvantages of arraydump compared to xxd
+------------------------------------------
+
+Of course we live and work in an engineering world, and (almost) no tool comes
+with advantages alone. The folloing issues need to be considered when using
+`arraydump`.
+
+1. Young project:
+   `arraydump` is a very young tool. Because of this, it has not seen a lot of
+   use outside the `extfs` project. This means that there are probably bugs that
+   have not yet surfaced and might cause wrong output to be produced. If you
+   find any bugs, please do not hessitate to report them, or even better create
+   a pull request.
+
+2. Written in Python:
+   In contrast to `xxd`, which is written in **C**, `arraydump` is written in
+   **Python**. There is nothing inherently bad about this, it just means that you
+   will need a **Python 3** compatible interpreter on your system to use
+   `arraydump`. You will need to keep that in mind if you, for example, use the
+   tool in your `CI` setup. Additionally, being written in an interpreted
+   language, `arraydump` will probably use more resources for processing than
+   `xxd`.
+
+3. Only **C++** header files can be generated: `xxd` provides several different
+   output formats as well as different modes of operation. `arraydump`, on the
+   other hand, was specifically designed to produce **C++** header files. That
+   is all it can do.
+
+Usage
+-----
+
+The output of `arraydump -h` is pretty self-explanatory
+
+.. code-block:: text
+
+  usage: arraydump [-h] [--output dir] [--columns cols] [--extension ext]
+                   [--type {int8,uint8,char,schar,uchar}]
+                   file [file ...]
+
+  Convert binaries to C++ headers
+
+  positional arguments:
+    file                  The input file to process
+
+  optional arguments:
+    -h, --help            show this help message and exit
+    --output dir          The target directory for the generated file(s)
+    --columns cols        The number of columns in the output
+    --extension ext       The file extension for the generated header
+    --type {int8,uint8,char,schar,uchar}
+                          The array element type
diff --git a/doc/src/tools/index.rst b/doc/src/tools/index.rst
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+Developer Tools
+===============
+
+.. toctree::
+  :maxdepth: 1
+
+  arraydump