Chinese Version of RELEASE.md of Release v0.10.0

As we will announce Release v0.10.0 in our wechat platform, we need chinese version of [RELEASE.md](https://github.com/PaddlePaddle/Paddle/blob/develop/RELEASE.md). Please create RELEASE.cn.md, and translate [the part of Release v0.10.0](https://github.com/PaddlePaddle/Paddle/blob/develop/RELEASE.md#release-v0100) in RELEASE.md.