shard stub

doc/sphinx/reference/index.rst

@@ -23,3 +23,4 @@
     pickle
     other
     expirationd
+    shard

doc/sphinx/reference/shard.rst

+-------------------------------------------------------------------------------
+                            Package `shard`
+-------------------------------------------------------------------------------
+
+.. module:: shard
+
+With `sharding`_,
+the tuples of a tuple set are distributed
+to multiple nodes, with a Tarantool database server on each node. With this arrangement,
+each server is handling only a subset of the total data, so larger loads can be
+handled by simply adding more computers to a network.
+
+The Tarantool shard package has facilities
+for creating or redistributing or cleaning up shards, as well as analogues for the
+data-manipulation functions of the box library (select, insert, replace, update, delete).
+
+Some details are `On the shard section of github`_.
+
+
+.. _sharding: https://en.wikipedia.org/wiki/Sharding
+.. _On the shard section of github: https://github.com/tarantool/shard
+
+