Add installation instructions

README.md

@@ -10,7 +10,7 @@ You need to have Docker installed on your machine. You can find instructions on
 
 ## Installation
 
-
+First, download the [latest release](https://github.com/rails/rails-new/releases/tag/latest) for your operating system. Click on the downloaded `.tar.gz` file to unzip it, which will create the `rails-new` executable. Move the executable into your path so that it is ready to run from the command line.
 
 ## Usage
 
@@ -24,3 +24,5 @@ Or with options:
 ```bash
 rails-new myapp --main
 ```
+
+The list of available options is found in the [Rails guides](https://guides.rubyonrails.org/command_line.html#rails-new).