Changed doxygen config

Doxyfile

@@ -990,6 +990,7 @@ INPUT_FILE_ENCODING    =
 # *.f18, *.f, *.for, *.vhd, *.vhdl, *.ucf, *.qsf and *.ice.
 
 FILE_PATTERNS          = *.c \
+                         *.cpp \
                          *.h \
                          *.hpp \
                          *.md \