Removed contribution and adjusted license

Author: davidmenardunity

CODE_OF_CONDUCT.md

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+ROS TCP Connector copyright © 2021 Unity Technologies.
+
+This software is subject to, and made available under the Apache 2.0 license (the “License”). You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
+
+Unless expressly provided otherwise, the software under this license is made available strictly on an “AS IS” BASIS WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. Please review the Terms of Service for details on these and other terms and conditions.