Translate PaddlePaddle发行规范 to English

[shanyi15]

Now, fluid documentation has been shown on paddlepaddle.org
However, there are 2 docs that don't have English version
If we translate these 2 docs, then the English version fluid doc is complete.

Please translate PaddlePaddle发行规范

Chinese： github link, website link
English：None

Thank you!