Added scaffolding

This is from https://github.com/TheLartians/ModernCppStarter/

documentation/conf.py

@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2023 github.com/TheLartians
+#
+# SPDX-License-Identifier: CC0-1.0
+
+DOXYFILE = 'Doxyfile'
+
+LINKS_NAVBAR1 = [
+    (None, 'pages', [(None, 'about')]),
+    (None, 'namespaces', []),
+]
+
+# Add your own navbar links using the code below.
+# To find the valid link names, you can inspect the URL of a generated documentation site.
+
+# LINKS_NAVBAR1 = [
+#     (None, 'pages', [(None, 'about')]),
+#     (None, 'namespaces', [(None, 'namespacegreeter')]),
+# ]
+#
+# LINKS_NAVBAR2 = [
+#     (None, 'annotated', [(None, 'classgreeter_1_1_greeter')]),
+#     (None, 'files', [(None, 'greeter_8h')]),
+# ]