docs: license header added

gradle.properties

@@ -1,3 +1,22 @@
+# /********************************************************************************
+# * Copyright (c) 2021,2023 Contributors to the Eclipse Foundation
+# *
+# * See the NOTICE file(s) distributed with this work for additional
+# * information regarding copyright ownership.
+# *
+# * This program and the accompanying materials are made available under the
+# * terms of the Apache License, Version 2.0 which is available at
+# * https://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.
+# *
+# * SPDX-License-Identifier: Apache-2.0
+# ********************************************************************************/
+
 springCloudVersion=2023.0.0
 testContainerVersion=1.19.3
 jacocoVersion=0.8.9