docs: add webhook document

website/docs/notification/webhook.md

@@ -0,0 +1,43 @@
+---
+sidebar_position: 5
+---
+
+# Webhook
+
+If you need a more flexible notification method, you can try using custom webhooks to notify your messages. This way, you can integrate Tianji's notifications into any system.
+
+### Example Result
+
+```json
+{
+    "notification": {
+        "workspaceId": "xxxxxxxxxxx",
+        "name": "New Notification",
+        "type": "webhook",
+        "payload": {
+            "webhookUrl": "example.com"
+        }
+    },
+    "title": "New Notification Notification Testing",
+    "content": "Tianji: Insight into everything\\nThis is Notification Testing from New Notification\\n[image]",
+    "raw": [
+        {
+            "type": "title",
+            "level": 2,
+            "content": "Tianji: Insight into everything"
+        },
+        {
+            "type": "text",
+            "content": "This is Notification Testing from New Notification"
+        },
+        {
+            "type": "newline"
+        },
+        {
+            "type": "image",
+            "url": "https://tianji.msgbyte.com/img/social-card.png"
+        }
+    ],
+    "time": "2024-06-19T15:41:09.390Z"
+}
+```