Added composer support

Author: dosten

.gitignore

@@ -1,2 +1,5 @@
 lib/RingcaptchaForTesting.php
 lib/cacert.pem
+vendor/
+composer.lock
+composer.phar

composer.json

@@ -0,0 +1,25 @@
+{
+    "name": "ringcaptcha/ringcaptcha",
+    "type": "library",
+    "description": "A PHP module for communicating with the RingCaptcha API",
+    "keywords": ["verification", "onboarding", "gateway"],
+    "homepage": "http://ringcaptcha.com",
+    "license": "Apache-2.0",
+    "authors": [
+        {
+            "name": "Diego Saint Esteben",
+            "email": "diego@saintesteben.me"
+        },
+        {
+            "name": "GitHub Community",
+            "homepage": "https://github.com/ringcaptcha/ringcaptcha-php/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=5.3.9",
+        "ext-curl": "*"
+    },
+    "autoload": {
+        "classmap": ["lib/"]
+    }
+}