API: Add icsneoc2

docs/icsneoc2/.gitignore

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+doxygen

docs/icsneoc2/api.rst

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+======
+C2 API
+======
+
+.. doxygenfile:: icsneoc2.h
+   :project: icsneoc2
+.. doxygenfile:: icsneoc2messages.h
+   :project: icsneoc2
+.. doxygenfile:: icsneoc2settings.h
+   :project: icsneoc2
+.. doxygenfile:: icsneoc2types.h
+   :project: icsneoc2

docs/icsneoc2/examples.rst

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+=================
+icsneoc2 Examples
+=================
+
+Simple
+======
+
+:download:`Download example <../../examples/c2/simple/src/main.c>`
+
+.. literalinclude:: ../../examples/c2/simple/src/main.c
+   :language: c
+
+Disk Format
+===========
+
+:download:`Download example <../../examples/c2/diskformat/src/main.c>`
+
+.. literalinclude:: ../../examples/c2/diskformat/src/main.c
+   :language: c
+
+Read Messages
+=============
+
+:download:`Download example <../../examples/c2/read_messages/src/main.c>`
+
+.. literalinclude:: ../../examples/c2/read_messages/src/main.c
+   :language: c

docs/icsneoc2/index.rst

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+icsneoc2
+========
+
+.. toctree::
+   :maxdepth: 2
+
+   installation
+   examples
+   api

docs/icsneoc2/installation.rst

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+============
+Installation
+============
+
+The installation steps for the C2 API are the same as the C++ API as the C2 API is
+a wrapper for the C++ library. The ``LIBICSNEO_BUILD_ICSNEOC2`` CMake option is
+default ``ON`` but note that the C2 API depends on this flag to build.