Update README.md

Author: JanSlabon

README.md

@@ -3,3 +3,19 @@
 **THERE WILL BE NO DEVELOPMENT IN THIS REPOSITORY!**
 
 FPDF is a PHP class which allows to generate PDF files with pure PHP. F from FPDF stands for Free: you may use it for any kind of usage and modify it to suit your needs.
+
+## Instalation with [Composer](https://packagist.org/packages/setasign/fpdf)
+
+If you're using Composer to manage dependencies, you can use
+
+    $ composer require "setasign/fpdf": "1.7"
+
+or you can include the following in your composer.json file:
+
+```json
+{
+    "require": {
+        "setasign/fpdf": "1.7"
+    }
+}
+```