DOCSP-13490: [BIC] Missing instruction for installing biconnector as service on RHEL (#288)

Author: steveren

source/launch.txt

@@ -319,6 +319,21 @@ see :ref:`Configuration File <config-format>`. For example:
               bindIp: '127.0.0.1'
               port: 3307
 
+         To install and run ``mongosqld`` as a system service, run the
+         following commands:
+
+         .. code-block:: sh
+
+            sudo mongosqld install --config <pathToConfigFile>/mongosqld.conf
+            sudo systemctl start mongosql.service
+
+         To enable the service so it starts automatically at boot time,
+         run the following:
+
+         .. code-block:: sh
+
+            systemctl enable mongosql.service
+
          RHEL 6.x / CentOS 6.x
          ~~~~~~~~~~~~~~~~~~~~~