DL-182: assembled package should include README.md
DL-182: assembled package should include README.md

Author: xieliang <xieliang007@gmail.com>

Reviewers: Sijie Guo <sijie@apache.org>

Closes #112 from xieliang/DL-182-assembled

sijie/incubator-distributedlog,sijie/incubator-distributedlog,sijie/incubator-distributedlog,sijie/incubator-distributedlog,sijie/incubator-distributedlog