erofs-utils: introduce miscellaneous files

This patch introduces a global configuration scheme, some
functions which can print messages in different level,
build scripts and .gitignore file.

Signed-off-by: Li Guifu <bluce.liguifu@huawei.com>
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Fang Wei <fangwei1@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..ee5fd92
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Makefile.am
+
+ACLOCAL_AMFLAGS = -I m4
+
+SUBDIRS=lib