Closes #25

core/core_files.pri

@@ -1,4 +1,5 @@
 SOURCES += \
+    $$PWD/dbc_attributes.cpp \
     $$PWD/decode_database.cpp \
     $$PWD/dbc_decode_builder.cpp \
     $$PWD/dbc_decoder.cpp \
@@ -8,6 +9,7 @@ SOURCES += \
     $$PWD/tree_node.cpp
 
 HEADERS += \
+    $$PWD/attributes.h \
     $$PWD/j1939.h \
     $$PWD/signal_layout.h \
     $$PWD/definition_key.h \