Merge pull request #5305 from zmstone/chore-add-notice-files

chore: add notice files

NOTICE

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+EMQ X, highly scalable, highly available distributed MQTT messaging platform for IoT.
+Copyright (c) 2017-2021 EMQ Technologies Co., Ltd. All Rights Reserved.
+
+This product contains code developed at EMQ Technologies Co., Ltd.
+Visit https://www.emqx.come to learn more.

apps/emqx/NOTICE

@@ -0,0 +1,5 @@
+EMQ X, highly scalable, highly available distributed MQTT messaging platform for IoT.
+Copyright (c) 2017-2021 EMQ Technologies Co., Ltd. All Rights Reserved.
+
+This product contains code developed at EMQ Technologies Co., Ltd.
+Visit https://www.emqx.come to learn more.