docs: add docs for lark oauth provider (#511)

* docs: add docs for lark oauth provider

* docs: add newline character

docs/provider/oauth/lark.md

@@ -0,0 +1,38 @@
+---
+title: Lark
+description: Add Lark OAuth provider to your application
+keywords: [Lark, OAuth]
+authors: [Chinoholo0807]
+---
+
+:::note
+
+This is an example of how to configure a **Lark** OAuth provider.
+
+:::
+
+### Step1. Create a Lark application
+
+First, you need to create a new application in [Lark Open Platform](https://open.feishu.cn/) and enable it.
+You can find the `App ID` and `App Secret` in the basic information of your application.
+
+![create a new app](/img/providers/OAuth/lark_create_app.png)
+
+Next, add the redirect URL `<your-casdoor-domain>/callback` (e.g., `http://localhost:7001/callback`) in the security settings of your application.
+
+![add redirect url](/img/providers/OAuth/lark_redirect_url.png)
+
+### Step2. Create a Lark OAuth provider
+
+Now create a Lark OAuth provider in Casdoor. Fill the necessary information.
+
+|    Name       |   Name in Lark |
+|      ----     |   ----          |  
+|Category       |   choose `OAuth`                     |
+|Type           |   choose `Lark`                      |
+|Client ID      |   `App ID` obtained from Step1       |
+|Client secret  |   `App Secret` obtained from Step1   |
+
+![create a lark oauth provider](/img/providers/OAuth/lark_provider_conf_detail.png)
+
+Now you can use Lark as the third party service to complete authentication.

sidebars.js

@@ -154,6 +154,7 @@ module.exports = {
             "provider/oauth/azureAD",
             "provider/oauth/infoflow",
             "provider/oauth/okta",
+            "provider/oauth/lark",
           ],
         },
         "provider/email",