Added README changes to show install steps

README.md

@@ -2,6 +2,19 @@
  
 This is a crystal project to manage setting up OptionParser objects based around "Command" objects and arguments you define inside them.
 
+## Installation
+
+1. Add the dependency to your `shard.yml`:
+
+   ```yaml
+   dependencies:
+     cligen:
+       git: https://git.arcanium.tech/tristan/cligen
+   ```
+
+2. Run `shards install`
+
+
 ## Usage
 ```crystal
 require "cligen"