Update README.md

Author: devnix

README.md

@@ -1,2 +1,31 @@
-# Vagrant-dependency-manager
+# Vagrant dependency manager
 Simple snippet that allows you to define a list of plugins in your Vagrantfile, and manage them as dependencies.
+
+I am not a Ruby programmer (yet) and this is a young software, so any issues and pull requests are always welcome! 
+
+## Installation
+
+Just clone this package on the folder you will always do `vagrant up`, or just paste `dependency_manager.rb` on that directory.
+
+## Usage
+
+Include `dependency_manager.rb` in your Vagrantfile and call the function `check_plugins` with an array of plugin names.
+
+`Vagrant dependency manager` will check if the named plugins are installed. If they are the boot will continue as always. If a plugin is not installed, it will perform a `vagrant plugin install 'packagename'` and continue. If the package does not exists or there is a problem with the installation, the application will exit with an error code.
+
+### Example
+
+```ruby
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+require "./dependency_manager"
+
+check_plugins ["vagrant-exec", "vagrant-hostsupdater", "vagrant-cachier", "vagrant-triggers"]
+
+Vagrant.configure(2) do |config|
+
+  config.vm.box = "base"
+
+end
+```