add config about docker-compose container for example

Author: jaehyeonpy

example/config.yaml

@@ -1,15 +1,15 @@
 # all fields must be filled.
 
 mysql:
-  host: '127.0.0.1'
-  port: 3306
+  host: '172.0.0.2' # or '127.0.0.1' 
+  port: 3306 # or 3307
   user: 'root'
-  password: '1234'
+  password: ''
   server_id: 2  # this should be unique. this may be different depending on environment.
   log_file: 'mysql-bin.000001' # this may be different depending on environment.
   log_pos: 0
   blocking: True # if true, mysql waits for new incoming event to send after pymyelarepl reads all the previous events.
 
 es:
-  host: '127.0.0.1'
-  port: 9200
+  host: '172.0.0.3' # or '127.0.0.1'
+  port: 9200 # or 9201