Add new step to install fix ros-infrastructure#7

Readme.md

@@ -102,7 +102,8 @@ introduction: 'Escrevendo CSS sem perder a sanidade. Com essa introdução, Rico
 In order to compile the assets and run Jekyll on local you need to follow those steps:
 
 - Install [NodeJS](https://nodejs.org/)
-- Run `npm install` 
+- Run `npm install`
+- Run `npm install -g gulp gulp-cli` (maybe you need to use `sudo` command)
 - Run `gulp`
 
 ## Windows 10 Step
@@ -125,7 +126,3 @@ If you liked my work, buy me a coffee <3
 This theme is free and open source software, distributed under the The MIT License. So feel free to use this Jekyll theme on your site without linking back to me or using a disclaimer.
 
 If you’d like to give me credit somewhere on your blog or tweet a shout out to [@willian_justen](https://twitter.com/willian_justen), that would be pretty sweet.
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