Merge branch 'doxygen' into 'main'

Docs - Introduce Doxygen documentation setup

See merge request feta/wif-group/libwif!42

Author: plnyrich

.gitignore

@@ -3,3 +3,6 @@ build/
 
 # Visual Studio files
 .vscode/
+
+# Doxygen-generated documentation
+docs/