fix: license

Author: lansheng

LICENSE

@@ -0,0 +1,11 @@
+木兰宽松许可证
+
+Copyright (c) [2019] [link1st]
+[gowebsocket] is licensed under the Mulan PSL v1.
+You can use this software according to the terms and conditions of the Mulan PSL v1.
+You may obtain a copy of Mulan PSL v1 at:
+    http://license.coscl.org.cn/MulanPSL
+THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
+PURPOSE.
+See the Mulan PSL v1 for more details.