* Moving testflows tests into tests/testflows directory.

* Adding a simple README.md.

tests/testflows/README.md

@@ -0,0 +1,50 @@
+## ClickHouse Tests in [TestFlows]
+
+This directory contains integration tests written using [TestFlows] 
+that involves several ClickHouse instances, custom configs, ZooKeeper, etc.
+
+## Supported environment
+
+* [Ubuntu] 18.04
+* [Python 3] >= 3.6
+
+## Prerequisites
+
+* [Docker] [install](https://docs.docker.com/compose/install/)
+* [Docker Compose] [install](https://docs.docker.com/engine/install/)
+* [TestFlows] [install](https://testflows.com/handbook/#Installation) 
+
+## Running tests locally
+
+You can run tests locally by passing `--local` and `--clickhouse-binary-path` to the `regression.py`.
+
+* `--local` specifies that regression will be run locally
+* `--clickhouse-binary-path` specifies the path to the ClickHouse binary that will be used during the regression run
+
+> Note: you can pass `-h` or `--help` argument to the `regression.py` to see a help message.
+>
+> ```bash
+> python3 regression.py -h
+> ```
+
+> Note: make sure that the ClickHouse binary has correct permissions. 
+> If you are using `/usr/bin/clickhouse` its owner and group is set to `root:root` by default 
+> and it needs to be changed to `clickhouse:clickhouse`. You can change the owner and the group 
+> using the following command.
+> 
+> ```bash
+> sudo chown clickhouse:clickhouse /usr/bin/clickhouse
+> ```
+
+Using the default ClickHouse installation and its server binary at `/usr/bin/clickhouse`, you can run 
+regressions locally using the following command.
+
+```bash
+python3 regression.py --local --clickhouse-binary-path "/usr/bin/clickhouse"
+```
+
+[Python 3]: https://www.python.org/
+[Ubuntu]: https://ubuntu.com/ 
+[TestFlows]: https://testflows.com
+[Docker]: https://www.docker.com/
+[Docker Compose]: https://docs.docker.com/compose/