Added readme

README.md

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+# Accept Header Service Provider
+
+This serivce provider enables you to easily filter routes based on accept headers.
+
+To use it, simply do the following:
+
+    <?php
+
+    use Pff\ServiceProvider\AcceptHeaderServiceProvider\AcceptHeaderServiceProvider;
+
+    $app->register(new AcceptHeaderServiceProvider());
+
+    $app->get('/test', function($accept_header) {
+        if ($accept_header == 'application/ven.test.v1+json')
+            $cont = json_encode(array('content' => 'hello'));
+        else
+            $cont = '<content>hello</content>';
+
+        return new Response($cont, 200, array('Content-Type' => $accept_header));
+    })->accept(array('application/ven.test.v1+json', 'application/ven.test.v1+xml'));
+
+
+    $app->get('/test', function($accept_header) {
+        if ($accept_header == 'application/ven.test.v2+json')
+            $cont = json_encode(array('content' => 'hiya'));
+        else
+            $cont = '<content>hiya</content>';
+
+        return new Response($cont, 200, array('Content-Type' => $accept_header));
+    })->accept(array('application/ven.test.v2+json', 'application/ven.test.v2+xml'));
+
+
+Now a request with accept headers including `application/ven.test.v1+json` and `application/ven.test.v1+xml`
+will be handled by the first route, and requests with accept headers including `application/ven.test.v2+json` and
+`application/ven.test.v2+xml` will be routed to the second.