Added info about 'draft:true' (matcornic#74)

Not sure it's the best place to go in the documentation, but I thought this might prevent new Hugo user to wonder why no content was listed.

exampleSite/content/basics/installation/_index.en.md

@@ -58,6 +58,8 @@ hugo new --kind chapter basics/_index.md
 
 By opening the given file, you should see the property `chapter=true` on top, meaning this page is a _chapter_.
 
+By default all chapters and pages are created as draft. If you want to render these pages, remove the property `draft: true` from the metadata.
+
 ## Create your first content pages
 
 Then, create content pages inside the previous chapter. Here are two ways to create content in the chapter :
@@ -97,4 +99,4 @@ A `public` folder has been generated, containing all statics content and assets
 
 {{% notice note %}}
 This website can be automatically published and hosted with [Netlify](https://www.netlify.com/) (Read more about [Automated HUGO deployments with Netlify](https://www.netlify.com/blog/2015/07/30/hosting-hugo-on-netlifyinsanely-fast-deploys/)). Alternatively, you can use [Github pages](https://gohugo.io/hosting-and-deployment/hosting-on-github/)
-{{% /notice %}}
+{{% /notice %}}