doc: add troubleshooting page in user manual.

docs/zh/06-advanced/06-TDgpt/07-faq.md

@@ -0,0 +1,24 @@
+---
+title: "常见问题"
+sidebar_label: "常见问题"
+---
+
+1. 创建 anode 失败
+
+```bash
+taos> create anode '127.0.0.1:6090';
+
+DB error: Analysis service can't access[0x80000441] (0.117446s)
+```
+
+请检查 anode 服务是否工作正常。
+
+```bash
+curl '127.0.0.1:6090'
+curl: (7) Failed to connect to 127.0.0.1 port 6090: Connection refused
+```
+
+```bash
+TDengine© Time Series Data Analytics Platform (ver 1.0.x)
+```
+