added config.js; udpated README.md

.gitignore

@@ -4,4 +4,4 @@
 # Node.js
 node_modules
 npm-debug.log
-config.js
+config.js.mine

README.md

@@ -16,6 +16,20 @@ You can integrate into below applications or frameworks.
 
     $ npm install passport-rakuten
 
+## Preparation
+
+edit config.js to setup your application.
+
+    $ vim config.js
+	 /**
+	 * Config
+	 */
+	module.exports = {
+	    client_id: "your_client_id",
+	    client_secret: "your_client_secret",
+	    redirect_uri: "your_redirect_uri"
+	}
+
 ## Usage
 
 ### Configuration Strategy

config.js

@@ -0,0 +1,8 @@
+/**
+ * Config
+ */
+module.exports = {
+  client_id: "your_client_id",
+  client_secret: "your_client_secret",
+  redirect_uri: "your_redirect_uri"
+}

examples/login/config.js

@@ -0,0 +1 @@
+../../config.js