chore: add update.xml from MokoStandards

update.xml

@@ -0,0 +1,39 @@
+<!--
+  Joomla Extension Update Server XML
+  See: https://docs.joomla.org/Deploying_an_Update_Server
+
+  This file is the update server manifest for {{EXTENSION_NAME}}.
+  The Joomla installer polls this URL to check for new versions.
+
+  The manifest.xml in this repository must reference this file:
+    <updateservers>
+      <server type="extension" priority="1" name="{{EXTENSION_NAME}}">
+        https://git.mokoconsulting.tech/mokoconsulting-tech/MokoCassiopeia/raw/branch/main/update.xml
+      </server>
+      <server type="extension" priority="2" name="{{EXTENSION_NAME}}">
+        https://raw.githubusercontent.com/mokoconsulting-tech/MokoCassiopeia/main/update.xml
+      </server>
+    </updateservers>
+
+  When a new release is made, run `make release` or the release workflow to
+  prepend a new <update> entry to this file automatically.
+-->
+<updates>
+	<update>
+		<name>{{EXTENSION_NAME}}</name>
+		<description>MokoCassiopeia — Moko Consulting Joomla extension</description>
+		<element>{{EXTENSION_ELEMENT}}</element>
+		<type>{{EXTENSION_TYPE}}</type>
+		<version>{{VERSION}}</version>
+		<downloads>
+			<downloadurl type="full" format="zip">
+				https://git.mokoconsulting.tech/mokoconsulting-tech/MokoCassiopeia/releases/download/v{{VERSION}}/{{EXTENSION_ELEMENT}}.zip
+			</downloadurl>
+			<downloadurl type="full" format="zip">
+				https://github.com/mokoconsulting-tech/MokoCassiopeia/releases/download/v{{VERSION}}/{{EXTENSION_ELEMENT}}.zip
+			</downloadurl>
+		</downloads>
+		<targetplatform name="joomla" version="[56].*"/>
+		<php_minimum>8.1</php_minimum>
+	</update>
+</updates>