[Doc] Add English version of serving/ and java/andriod/. (#963)

* 第一次提交

* 补充一处漏翻译

* deleted:    docs/en/quantize.md

* Update one translation

* Update en version

* Update one translation in code

* Standardize one writing

* Standardize one writing

* Update some en version

* Fix a grammer problem

* Update en version for api/vision result

* Merge branch 'develop' of https://github.com/charl-u/FastDeploy into develop

* Checkout the link in README in vision_results/ to the en documents

* Modify a title

* Add link to serving/docs/

* Finish translation of demo.md

* Update english version of serving/docs/

* Update title of readme

* Update some links

* Modify a title

* Update some links

* Update en version of java android README

* Modify some titles

* Modify some titles

* Modify some titles

docs/api/vision_results/README_CN.md

@@ -1,4 +1,4 @@
-[English](README_EN.md)| 简体中文
+[English](README.md)| 简体中文
 # 视觉模型预测结果说明
 
 FastDeploy根据视觉模型的任务类型，定义了不同的结构体(`fastdeploy/vision/common/result.h`)来表达模型预测结果，具体如下表所示

docs/api/vision_results/matting_result_EN.md

@@ -1,6 +1,6 @@
 English | [中文](matting_result.md)
 
-# MattingResult keying results
+# Matting Result 
 
 The MattingResult code is defined in `fastdeploy/vision/common/result.h`, and is used to indicate the predicted value of alpha transparency predicted and the predicted foreground, etc.