Add cli

.eslintrc

@@ -1,6 +1,7 @@
 {
   "extends": "airbnb-base",
   "rules": {
-    "comma-dangle": 0
+    "comma-dangle": 0,
+    "no-console": "off"
   }
 }

README.md

@@ -32,6 +32,16 @@ isitup('github.com').then(data => {
 });
 ```
 
+## Command line usage
+Install it with `-g` flag:
+```bash
+npm install -g isitup
+```
+and in terminal type:
+```bash
+isitup github.com
+```
+and see help page with `isitup --help`.
 
 ## Tests
 

cli.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+const isitup = require('.');
+const meow = require('meow');
+const chalk = require('chalk');
+
+const log = console.log;
+
+const cli = meow(`
+  Usage:
+    $ isitup <website>
+
+  Examples:
+    $ isitup github.com
+`);
+
+// If url not set, show help and exit.
+if (cli.input[0] === undefined) {
+  cli.showHelp();
+}
+
+isitup(cli.input[0]).then(data => {
+  let output = `domain: ${chalk.green(data.domain)}\n`;
+  output += `port: ${chalk.green(data.port)}\n`;
+  output += `status code: ${chalk.green(data.status_code)}\n`;
+  output += `response ip: ${chalk.green(data.response_ip)}\n`;
+  output += `response code: ${chalk.green(data.response_code)}\n`;
+  output += `response time: ${chalk.green(data.response_time)}`;
+  log(output);
+}).catch(err => {
+  log(err);
+});