Add BasicAuth info to readme

README.md

@@ -139,3 +139,16 @@ foreach ( $items as $item ) {
 Save and dispatch the queue:
 
 `$this->example_process->save()->dispatch();`
+
+### BasicAuth
+
+If your site is behind BasicAuth, both async requests and background processes will fail to complete. This is because WP Background Processing relies on the [WordPress HTTP API](http://codex.wordpress.org/HTTP_API), which requires you to attach your BasicAuth credentials to requests. The easiest way to do this is using the following filter:
+
+```
+function wpbp_http_request_args( $r, $url ) {
+	$r['headers']['Authorization'] = 'Basic ' . base64_encode( USERNAME . ':' . PASSWORD );
+
+	return $r;
+}
+add_filter( 'http_request_args', 'wpbp_http_request_args', 10, 2);
+```