* add embedding example in embeddings.md

* add embedding.md link in toke_embedding readme

* fix windows url bug

* add more English embedding name

* fix doc bug

* delete useless description

* add comments of TokenEmbedding

* add embedding model info

fix url bug for word2vec

fix bugs;add more baidu embedding name

* add all wiki embedding and part of baidu encyclopedia embedding.

* add embedding example

* add people_daily, weibo, sougou pretrained embedding

* add zhihu, finacial,literature embedding

* Add embedding model readme; add embedding train example and readme

* fix README example

* fix embedding doc