Add extra link to howto index

README.md

@@ -3,6 +3,9 @@
 Configure and manage a [GitLab](https://about.gitlab.com) development
 environment.
+Read on for installation instructions or skip to
+[doc/howto](doc/howto/README.md) for usage documentation.
+
 ## Overview
 GitLab Development Kit (GDK) provides a collection of scripts and
@@ -12,6 +15,8 @@ multiple repositories and it requires Ruby, Go, Postgres/MySQL, Redis
 and more to run. GDK helps you install and configure all these
 different components, and start/stop them when you work on GitLab.
+## Getting started
+
 To start using GDK follow these three steps:
 - [Prepare your computer](doc/prepare.md)