update README

README.md

@@ -1,4 +1,48 @@
 nodejs-statsd-mysql-backend
 ===========================
 
-Backend MySQL pour Statsd
+Backend MySQL pour Statsd
+
+## Install
+Go into directory containing Statsd and axecute this command :
+```bash
+git clone https://github.com/fradinni/nodejs-statsd-mysql-backend.git
+```
+You should have a new directory called 'nodejs-statsd-mysql-backend' just next to the Statsd directory.
+
+## Configuration
+Edit Statsd configuraton file and add mysql-backend configuration.
+
+Example :
+```bash
+{
+  graphitePort: 2003
+, graphiteHost: "localhost"
+, port: 8125
+, backends: [ "../nodejs-statsd-mysql-backend/mysql-backend.js" ] // Backend MySQL
+
+  // MySQL Backend minimal configuration
+, mysql: { 
+	   host: "localhost", 
+	   port: 3306, 
+	   user: "root", 
+	   password: "root", 
+	   database: "statsd_db"
+  }
+}
+```
+Required parameters :
+
+	host:	MySQL instance host
+	port:	MySQL instance port
+	user:	MySQL user
+	password: MySQL password
+	database:	Default database where statsd table are stored
+
+Optional parameters :
+
+	tables:		List of tables names used (ex: ["stats", "users"])
+	engines:	List of MySQL Backend engines (see 'MySQL Bakend Engines' chapter for more details)
+
+
+## Introduction