Добавлена утилита gpio-watch

diff --git a/gpio-watch b/gpio-watch
new file mode 160000 (submodule)
index 0000000..f6e10ab
--- /dev/null
+++ b/gpio-watch
@@ -0,0 +1 @@
+Subproject commit f6e10abe50660d343327545f4c36480c5567b106