PR功能描述 / 为什么需要这个合入:
Translate the contents of community-membership into English
该PR关联的issue (格式为fixes #<issue号>, 或者resolves #<issue号>): fixes #

希望检视人员了解:
1.change the name of community-membership.md to community-membership_cn.md
2.add english version to community-membership.md
Release note: