docs: add shared application (#628)

* docs: add shared application

* feat: use demo site as example

docs/application/shared-application.md

@@ -0,0 +1,30 @@
+---
+title: Shared Application
+description: Shared application across organizations
+keywords: [shared, application]
+authors: [DacongDA]
+---
+
+## Introduction
+
+If you want to create an application that can be shared with other organizations, you can enable Is Shared field in applicaion(for safety reason, only built-in organization can create shared application). To specified the organiztion, you should add `-org-` and organization name after clientId / application name. For example, the clientId of application is `2dc94ccbec09612c04ac`, your organization name is `casbin`, the clientId for your organization is `2dc94ccbec09612c04ac-org-casbin` and the login url for oauth is `https://door.casdoor.com/login/oauth/authorize?client_id=2dc94ccbec09612c04ac-org-casbin&response_type=code&redirect_uri=http://localhost:9000&scope=read&state=casdoor`.
+
+## Configuration
+
+1. First create a new application.
+2. Enable Is Shared field.
+3. add `-org-` to split organization and clientId / application name.
+
+![shared application field](/img/application/shared-application/shared_application_field.png)
+
+![shared application login link](/img/application/shared-application/shared_application_login_link.png)
+
+:::caution
+
+Once you shared an application, it can be used by all organizations, and cannot be disabled for a particular organization.
+
+:::
+
+Here is a demo video that shows how to use shared application:
+
+<video src="/img/application/shared-application/shared_application_demo.mp4" controls="controls" width="100%"></video>

sidebars.js

@@ -135,6 +135,7 @@ module.exports = {
         "application/specify-login-organization",
         "application/tags",
         "application/invitation-code",
+        "application/shared-application",
       ],
     },
     {