CWG-10 Skeleton C++.

Initial C++ skeleton project.

doc/CMakeLists.txt

+# Copyright (C) ASTRON (Netherlands Institute for Radio Astronomy)
+# SPDX-License-Identifier: Apache-2.0
+
 find_package(Doxygen REQUIRED)
 find_package(Sphinx REQUIRED)
 
+#
+# The code is based on
+# https://devblogs.microsoft.com/cppblog/clear-functional-c-documentation-with-sphinx-breathe-doxygen-cmake/
+#
+
 #
 # Determine the public headers for the API documentation.
 #
@@ -51,4 +59,4 @@ add_custom_command(
   COMMENT "Generating documentation with Sphinx")
 
 # Nice named target so we can run the job easily
-add_custom_target(Sphinx ALL DEPENDS ${SPHINX_INDEX_FILE})
+add_custom_target(sphinx ALL DEPENDS ${SPHINX_INDEX_FILE})