add template for server setting

docs/_description_templates/template-server-setting.md

@@ -0,0 +1,31 @@
+## server_setting_name {#server_setting_name}
+
+Description.
+
+Describe what is configured in this section of settings.
+
+Possible value: ...
+
+Default value: ...
+
+Settings: (Optional)
+
+If the section contains several settings, list them here. Specify possible values and default values:
+
+-   setting_1 — Description.
+-   setting_2 — Description.
+
+**Example:**
+
+<server_setting_name>
+    <setting_1> ... </setting_1>
+    <setting_2> ... </setting_2>
+</server_setting_name>
+
+**Additional Info** (Optional)
+
+The name of an additional section can be any, for example, **Usage**.
+
+**See Also** (Optional)
+
+-   [link](#)