Added AUTHORS and LICENSE [#METR-20000].

AUTHORS

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+The following authors have created the source code of "ClickHouse"
+published and distributed by YANDEX LLC as the owner:
+
+Alexey Milovidov <milovidov@yandex-team.ru>
+Alexey Arno <af-arno@yandex-team.ru>
+Andrey Mironov <hertz@yandex-team.ru>
+Michael Kolupaev <mkolupaev@yandex-team.ru>
+Pavel Kartavyy <kartavyy@yandex-team.ru>
+Evgeniy Gatov <egatov@yandex-team.ru>
+Sergey Fedorov <fets@yandex-team.ru>
+Vyacheslav Alipov <alipov@yandex-team.ru>
+Vladimir Chebotarev <chebotarev@yandex-team.ru>
+Dmitry Galuza <galuza@yandex-team.ru>
+Sergey Magidovich <mgsergio@yandex-team.ru>
+Anton Tikhonov <rokerjoker@yandex-team.ru>
+Alexey Vasiliev <loudhorr@yandex-team.ru>
+Andrey Urusov <drobus@yandex-team.ru>
+Vsevolod Orlov <vorloff@yandex-team.ru>
+Roman Peshkurov <peshkurov@yandex-team.ru>
+Michael Razuvaev <razuvaev@yandex-team.ru>
+Ilya Korolev <breeze@yandex-team.ru>
+Maxim Nikulin <mnikulin@yandex-team.ru>

LICENSE

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+Copyright 2016 YANDEX LLC
+
+   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.