* Update README.md

* Update README.eng.md

update ERNIE-GEN description

* Update README.md

更新 ERNIE-GEN 中文描述

* Update README.md

* Update README.eng.md

* Update README.md

update ERNIE-GEN url

* remove ernie-gen
Co-authored-by: Nkirayummy <shi.k.feng@gmail.com>
Co-authored-by: Nnbcc <nbcc.zz@gmail.com>