Add make function for verbs

Author: Ethan Ransdell

README.md

@@ -83,12 +83,12 @@ try {
 
 ```php
 
-$speakSentence = new BandwidthLib\Voice\Bxml\SpeakSentence("Hello!");
-$speakSentence->voice("susan");
-$speakSentence->locale("en_US");
-$speakSentence->gender("female");
-$response = new BandwidthLib\Voice\Bxml\Response();
-$response->addVerb($speakSentence);
+$speakSentence = BandwidthLib\Voice\Bxml\SpeakSentence::make("Hello!")
+    ->voice("susan")
+    ->locale("en_US")
+    ->gender("female");
+$response = BandwidthLib\Voice\Bxml\Response::make()
+    ->addVerb($speakSentence);
 echo $response->toBxml();
 ```
 

src/Voice/Bxml/Verb.php

@@ -22,4 +22,7 @@ abstract class Verb {
      */
     abstract protected function toBxml(DOMDocument $doc): DOMElement;
 
+    public static function make(): static {
+        return new static(...func_get_args());
+    }
 }