feat: add copyright

Signed-off-by: Xinwei Xiong(cubxxw-openim) <3293172751nss@gmail.com>

scripts/ensure_tag.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Copyright © 2023 OpenIM. All rights reserved.
+#
+# 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.
+
+version="${VERSION}"
+if [ "${version}" == "" ];then
+  version=v`gsemver bump`
+fi
+
+if [ -z "`git tag -l ${version}`" ];then
+  git tag -a -m "release version ${version}" ${version}
+fi