add Doxygen

CMakeLists.txt

@@ -142,3 +142,17 @@ add_custom_command(TARGET csvParserTest POST_BUILD   # Adds a post-build event t
     COMMAND ${CMAKE_COMMAND} -E copy_if_different  # which executes "cmake - E copy_if_different..."
         "${PROJECT_SOURCE_DIR}/examples/example.csv"   # <--this is in-file
         $<TARGET_FILE_DIR:csvParserTest>)            # <--this is out-file path
+
+
+
+# Doxygen documentation
+find_package(Doxygen)
+if (DOXYGEN_FOUND)
+    add_custom_target( doc_doxygen ALL
+        COMMAND ${DOXYGEN_EXECUTABLE} Doxyfile
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/..
+        COMMENT "Generating API documentation with Doxygen"
+        VERBATIM )
+else (DOXYGEN_FOUND)
+    message("Doxygen need to be installed to generate the doxygen documentation")
+endif (DOXYGEN_FOUND)