Add installation instructions to README

Daniel Gomes · Daniel Gomes · commit ab8d4e95e787 · 2019-01-25T22:39:34.000Z
diff --git a/README.md b/README.md
@@ -41,6 +41,12 @@ This way you have the possibility to use them and extend it's behavior tailored
 
 #### Basic usage
 
+##### Installation
+
+```bash
+composer require dcsg/php-immutable-collections
+```
+
 ###### Creating a Typed List Collection
 
 ```php
