Update basic-usage-database.md

Author: Smilefounder

website/docs/basic-usage-database.md

@@ -2,4 +2,18 @@
 id: basic-usage-database
 title: Database
 ---
-...
+...
+
+Example of submit data
+```
+Post API: '/api/v1/rest/en-us/attribute-set-data/client'
+
+Data JSON:
+{
+    "attributeSetName": "subscriber",
+    "obj": {
+        "id": null,
+        "email": "asdf@sadf.asdf"
+    }    
+}
+```