readme: list all our users

Author: ligurio

README.md

@@ -379,3 +379,10 @@ The following files will be removed:
 * `[0-9]*/`
 
 For a `core = unittest` test suite this option does not change any behaviour.
+
+### Used By
+
+- [Tarantool](https://github.com/tarantool/tarantool) - is an in-memory database and application server
+- [tarantool-python](https://github.com/tarantool/tarantool-python) - Python driver for Tarantool
+- [vshard](https://github.com/tarantool/vshard) - sharding based on virtual buckets
+- xsync (internal project)