Added composer

Author: jcugno

composer.json

@@ -0,0 +1,9 @@
+{
+  "name": "onelogin/php-saml",
+  "description": "Simple SAML toolkit for PHP",
+  "license": "BSD-3-Clause",
+  "keywords": ["saml"],
+  "autoload": {
+    "classmap": ["src/", "ext/"]
+  }
+}