Add User Label Cluster xml defination

src/app/zap-templates/zcl/data-model/chip/user-label-cluster.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<!--
+Copyright (c) 2021 Project CHIP Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+<configurator>
+  <domain name="CHIP"/>
+
+  <struct name="LabelStruct">
+    <cluster code="0x0041"/>
+    <item name="label" type="CHAR_STRING" length="16"/>
+    <item name="value" type="CHAR_STRING" length="16"/>
+  </struct>
+
+  <cluster>
+    <domain>General</domain>
+    <name>Fixed Label</name>
+    <code>0x0041</code>
+    <define>USER_LABEL_CLUSTER</define>
+    <description>The Fixed Label Cluster provides a feature to tag an endpoint with zero or more labels.</description>
+    <attribute side="server" code="0x0000" define="LABEL_LIST" type="ARRAY" entryType="LabelStruct" length="254" writable="false" optional="false">label list</attribute>
+  </cluster>
+</configurator>

src/app/zap-templates/zcl/zcl.json

@@ -52,6 +52,7 @@
         "thread-network-diagnostics-cluster.xml",
         "time-synchronization-cluster.xml",
         "tv-channel-cluster.xml",
+        "user-label-cluster.xml",        
         "wake-on-lan-cluster.xml",
         "wifi-network-diagnostics-cluster.xml",
         "window-covering.xml",