tools: add the Binlog Slave Client user guide (#706)
tools: add the Binlog Slave Client user guide (#706)

* tools: add the Binlog Slave Client user guide

* Fix a typo

* Update tools/binlog-slave-client.md

Co-Authored-By: CaitinChen <993aa8c4860e3c7690803b38a86b03e49bbad7db@users.noreply.github.com>

* Update tools/binlog-slave-client.md

Co-Authored-By: CaitinChen <993aa8c4860e3c7690803b38a86b03e49bbad7db@users.noreply.github.com>

* Update binlog-slave-client.md

* Add a summary

* Address a comment

pingcap/docs,pingcap/docs,pingcap/docs