docs: improve README.md

README.md

@@ -4,6 +4,9 @@ This is a [rebar3 template](https://rebar3.org/docs/tutorials/templates/#custom-
 
 This plugin template is for EMQX >= 5.0.
 
+We introduced a AVRO config schema mechanism for plugins in EMQX 5.7.0 to facilitate configuration updates for plugins at runtime via RESTAPI.
+Please see [priv/config_schmea.avsc.example](./priv/config_schmea.avsc.example) and [priv/config_i18n.json.example](./priv/config_schmea.avsc.example) as examples.
+
 For EMQX >= 4.3, please see branch emqx-v4
 
 For older EMQX versions, plugin development is no longer maintained.
@@ -27,9 +30,12 @@ $ rebar3 new emqx-plugin my_emqx_plugin
 $ make -C my_emqx_plugin rel
 ```
 
-**NOTE**
-If the `REBAR_CACHE_DIR` environment variable has been set, the directory for templates should be `$REBAR_CACHE_DIR/.config/rebar3/templates`.
-[Here](https://github.com/erlang/rebar3/issues/2762) is a relevant issue.
+> [!NOTE]
+> In order to use the AVRO config schema feature, please make sure the plugin template tag version >= 5.7.0
+
+> [!NOTE]
+> If the `REBAR_CACHE_DIR` environment variable has been set, the directory for templates should be `$REBAR_CACHE_DIR/.config/rebar3/templates`.
+> [Here](https://github.com/erlang/rebar3/issues/2762) is a relevant issue.
 
 This will create a tarball containing your custom plugin. You can use EMQX's Dashboard or it's command line tools to deploy it into your running EMQX cluster.