Add basic docker-compose setup

The setup contains a three node master-slave cluster with both
readwritesplit and readconnroute.

Removed the duplication of the configuration files in the README and
provided links instead.

docker/maxscale.cnf.d/example.cnf

@@ -0,0 +1,73 @@
+# Global parameters
+[maxscale]
+threads=auto
+
+[server1]
+type=server
+address=master
+port=3306
+protocol=MariaDBBackend
+
+[server2]
+type=server
+address=slave1
+port=3306
+protocol=MariaDBBackend
+
+[server3]
+type=server
+address=slave2
+port=3306
+protocol=MariaDBBackend
+
+# Monitor for the servers
+# This will keep MaxScale aware of the state of the servers.
+# MySQL Monitor documentation:
+# https://github.com/mariadb-corporation/MaxScale/blob/2.2/Documentation/Monitors/MariaDB-Monitor.md
+
+[MariaDB-Monitor]
+type=monitor
+module=mariadbmon
+servers=server1,server2,server3
+user=maxuser
+passwd=maxpwd
+monitor_interval=2000
+
+# Service definitions
+# Service Definition for a read-only service and a read/write splitting service.
+
+# ReadConnRoute documentation:
+# https://github.com/mariadb-corporation/MaxScale/blob/2.2/Documentation/Routers/ReadConnRoute.md
+
+[Read-Only-Service]
+type=service
+router=readconnroute
+servers=server1,server2,server3
+user=maxuser
+passwd=maxpwd
+router_options=slave
+
+# ReadWriteSplit documentation:
+# https://github.com/mariadb-corporation/MaxScale/blob/2.2/Documentation/Routers/ReadWriteSplit.md
+
+[Read-Write-Service]
+type=service
+router=readwritesplit
+servers=server1,server2,server3
+user=maxuser
+passwd=maxpwd
+
+# Listener definitions for the services
+# Listeners represent the ports the services will listen on.
+
+[Read-Only-Listener]
+type=listener
+service=Read-Only-Service
+protocol=MySQLClient
+port=4008
+
+[Read-Write-Listener]
+type=listener
+service=Read-Write-Service
+protocol=MySQLClient
+port=4006