doc: add license information (BSD-2-Clause)

AUTHORS

@@ -0,0 +1,16 @@
+In the order of a first contribution.
+
+Elizaveta Dokshina <eldokshina@mail.ru>
+Elena Shebunyaeva <elena.shebunyaeva@gmail.com>
+Oleg Babin <babinoleg@mail.ru>
+Sergey Volgin <savolgin@gmail.com>
+Konstantin Nazarov <mail@knazarov.com>
+Andreev Semen <semen.andreev00@mail.ru>
+Alexey Kuzin <akudiyar@gmail.com>
+Alexander Turenko <alexander.turenko@tarantool.org>
+Alexey Romanov <romanov.alexey2000@gmail.com>
+Anastasia Neklepaeva <neknas28@gmail.com>
+Yaroslav Dynnikov <yaroslav.dynnikov@gmail.com>
+Vladimir Rogach <vladimir.rogach@gmail.com>
+Sergey Bronnikov <sergeyb@tarantool.org>
+Georgy Moiseev <moiseev.georgii@gmail.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 * Statistics for CRUD operations on router (#224).
 * Integrate CRUD statistics with [`metrics`](https://github.com/tarantool/metrics) (#224).
+* Added LICENSE file into the repository (BSD-2-Clause).
 
 ### Changed
 * Optimize select with known bucket_id (#234).

LICENSE

@@ -0,0 +1,22 @@
+Copyright 2020-2022 crud AUTHORS: please see the AUTHORS file.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -920,3 +920,7 @@ Now your cluster contains storages that are configured to be used for
 CRUD-operations.
 You can simply call CRUD functions on the router to insert, select, and update
 data across the cluster.
+
+## License
+
+BSD-2-Clause. See the [LICENSE](LICENSE) file.