Update README

README.md

@@ -88,29 +88,49 @@ tzf-server -type 1
 
 ## Web Pages
 
+> [!NOTE]
+>
+> Please note that the live demo below is runned on a free plan of Render, so it
+> may take a while to start the server. Please do not use it for production.
+
 ### All supported timezone names
 
-[`http://localhost:8080/web/tzs/all`](http://localhost:8080/web/tzs/all)
+- [`http://localhost:8080/web/tzs/all`](http://localhost:8080/web/tzs/all)
+- Live demo: <https://tzf-server.onrender.com/web/tzs/all>
 
 ### [Experiment] Clickable debugger
 
-[`http://localhost:8080/web/click`](http://localhost:8080/web/click)
+- [`http://localhost:8080/web/click`](http://localhost:8080/web/click)
+- Live demo: <https://tzf-server.onrender.com/web/click>
 
 I have little knowledge about frontend development so it's just a experiment,
 most codes are written by ChatGPT 3.5. You can access the prompts from
 [gist](https://gist.github.com/ringsaturn/12b5509d80f69e7bca13da8745f7ce15).
 
 ## HTTP API
 
+> [!NOTE]
+>
+> Please note that the live demo below is runned on a free plan of Render, so it
+> may take a while to start the server. Please do not use it for production.
+
 A swagger UI can be found at
 [`http://localhost:8080/swagger/index.html`](http://localhost:8080/swagger/index.html).
 
+Or live demo: <https://tzf-server.onrender.com/swagger/index.html>
+
 ### Lookup Location's timezone
 
 ```bash
 curl "http://localhost:8080/api/v1/tz?longitude=116.3883&latitude=39.9289"
 ```
 
+or live demo:
+
+```bash
+curl "https://tzf-server.onrender.com/api/v1/tz?longitude=116.3883&latitude=39.9289"
+```
+
 Output:
 
 ```json
@@ -127,6 +147,12 @@ Output:
 curl "http://localhost:8080/api/v1/tzs?longitude=87.6168&latitude=43.8254"
 ```
 
+or live demo:
+
+```bash
+curl "https://tzf-server.onrender.com/api/v1/tzs?longitude=87.6168&latitude=43.8254"
+```
+
 Output:
 
 ```json
@@ -152,6 +178,12 @@ Output:
 curl "http://localhost:8080/api/v1/tzs/all"
 ```
 
+or live demo:
+
+```bash
+curl "https://tzf-server.onrender.com/api/v1/tzs/all"
+```
+
 Output:
 
 ```jsonc