toplevel Makefile and .gitignore, to wrap up

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

.gitignore

+*.o
+*.ko
+Module.symvers
+modules.order
+*~
+*.mod.c
+.*.cmd
+.tmp_versions
\ No newline at end of file

Makefile

+
+DIRS = kernel doc
+
+all clean:
+	for d in $(DIRS); do $(MAKE) -C $$d $@ || exit 1; done
\ No newline at end of file