add dss 0.9.0 upgrade notes

Author: Adamyuanyuan

docs/en_US/ch2/DSS_0.9.0_upgrade_notes.md

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+# DSS 0.9.0 upgrade notes
+
+In DSS-0.9.0, the concept “workspace” is added. If you upgrade from DSS 0.7 or DSS 0.8 to DSS0.9.0. After completing platform deployment, the following adjustments are needed to be made: field `application_id` of table `dss_onestop_menu_application` is NULL by default., which is a foreign key references field `id` of table `dss_application`. So the field `application_id` of table `dss_onestop_menu_application` needed to be filled choosing from field `id` of table `dss_application`, which accords to the actual situation of  business system, so as to connect workspace with each application. 
+E.g: 
+``` 
+-- Update application_id corresponding to workflow application 
+UPDATE dss_onestop_menu_application SET application_id = 2 WHERE id = 1; 
+-- Update application_id corresponding to Scriptis application 
+UPDATE dss_onestop_menu_application SET application_id = 1 WHERE id = 4; 
+``` 
+In addition, for users who have deployed DSS with edition 0.8.0 or below, the following adjustments are required: 
+Since field `workspace_id` is added to table `dss_project`, which is a foreign key references field `id` of table `dss_workspace`. The following command needs to be executed: 
+``` 
+ALTER TABLE dss_project ADD workspace_id bigint(20) DEFAULT 1; 
+``` 
+By default, original projects belongs to default workspace(workspace_id=1), users may add more workspace according to actual situation, and adjust the workspace of original projects as needed.

docs/zh_CN/ch2/DSS_0.9.0_升级说明.md

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+# DSS-0.9.0升级说明
+
+本次DSS-0.9.0版本新增用户工作空间（workspace）概念，如果您是从 DSS0.7 或 DSS0.8 升级到 DSS0.9.0，在完成平台部署后，需对数据库表做一些调整需作如下调整：
+dss_onestop_menu_application表中的application_id字段默认为空，该字段与dss_application表的id字段关联，需根据用户业务系统的实际情况与dss_application表进行关联，将用户工作空间与各应用打通。例如:
+```
+-- 更新workflow应用对应的application_id
+UPDATE dss_onestop_menu_application SET application_id = 2 WHERE id = 1;
+-- 更新Scriptis应用对应的application_id
+UPDATE dss_onestop_menu_application SET application_id = 1 WHERE id = 4;
+```
+此外，对于已部署DSS-0.8.0及以下版本的用户，还需做如下调整：
+dss_project表新增workspace_id字段，该字段与dss_workspace表的id字段关联，需在数据库执行如下命令：
+```
+ALTER TABLE dss_project ADD workspace_id bigint(20) DEFAULT 1;
+```
+默认情况下，所有原有项目都将归属默认工作空间（workspace_id=1），用户可根据实际情况新增用户空间，并调整原有项目的所属工作空间。