add composer

composer.json

@@ -0,0 +1,20 @@
+{
+    "name": "PeerJ/mpdf",
+    "type": "library",
+    "description": "mPDF is a PHP class which generates PDF files from UTF-8 encoded HTML. It is based on FPDF and HTML2FPDF, with a number of enhancements. (V 5.7.2)",
+    "keywords": ["php", "pdf", "utf-8"],
+    "homepage": "http://www.mpdf1.com",
+    "license": ["GPL"],
+    "authors": [
+        {
+             "name": "Ian Back"
+        }
+    ],
+    "require": {
+        "php": ">=5.0.3",
+        "ext-mbstring": "*"
+    },
+    "autoload": {
+        "classmap": ["mpdf.php"]
+    }
+}