GO: Added link to allow list template

Signed-off-by: kuritka <kuritka@gmail.com>

Go.gitignore

@@ -1,3 +1,6 @@
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
 # Binaries for programs and plugins
 *.exe
 *.exe~