添加例子：查看当前目录文件

Author: jaywcjlove

examples/ls.js

@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+
+var fs = require("fs"),
+    path = process.cwd();
+
+var run= function (obj) {
+    if(obj[0] === '-v'){
+        console.log('version is 1.0.0');
+    }else if(obj[0] === '-h'){
+        console.log('Useage:');
+        console.log('  -v --version [show version]');
+    }else{
+        fs.readdir(path, function(err, files){
+            if(err){
+                return console.log(err);
+            }
+            for(var i = 0; i < files.length; i += 1){
+                console.log(files[i]);
+            }
+        });
+    }
+};
+//获取除第一个命令以后的参数，使用空格拆分
+run(process.argv.slice(2));