add more about mysql query message.

README.md

@@ -1,7 +1,15 @@
 # portproxy
 A TCP port proxy utility inspired by qtunnel(https://github.com/getqujing/qtunnel)
 
-# Usage
+## How to Build
+
+ ```
+ git clone https://github.com/chenzhe07/portproxy.git
+ cd portproxy
+ go build -o portproxy *.go
+ ```
+
+## Usage
 
 ```
 Usage of ./portproxy:
@@ -11,3 +19,25 @@ Usage of ./portproxy:
   -daemon=false: run as daemon process
   -logTo="stdout": stdout or syslog
 ```
+portproxy can also log mysql queries:
+```
+./portproxy -backend="10.0.21.5:3301" -bind=":3316" -buffer=16384 
+2017/01/12 17:27:23 portproxy started.
+2017/01/12 17:27:32 client: 10.0.21.7:29110 ==> 10.0.21.5:3316
+2017/01/12 17:27:32 proxy: 10.0.21.5:18386 ==> 10.0.21.5:3301
+2017/01/12 17:27:32 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: select @@version_comment limit 1
+2017/01/12 17:27:48 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: SELECT DATABASE()
+2017/01/12 17:27:48 From 10.0.21.7:29110 To 10.0.21.5:3301; schema: use percona
+2017/01/12 17:27:48 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: show databases
+2017/01/12 17:27:49 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: show tables
+2017/01/12 17:27:49 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: table columns list: item
+2017/01/12 17:27:49 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: table columns list: stock
+2017/01/12 17:27:56 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: show tables
+2017/01/12 17:28:01 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: show create table item
+2017/01/12 17:28:04 From 10.0.21.7:29110 To 10.0.21.5:3301; Query: kill 2
+```
+
+## changelog:
+```
+20170112: log mysql query
+```