adding documentation

Author: stevenmaguire

README.md

@@ -45,6 +45,12 @@ Run `composer update`
 $results = $client->search(array('term' => 'Sushi', 'location' => 'Chicago, IL'));
 ```
 
+### Search by phone number
+
+```php
+$results = $client->searchByPhone(array('phone' => '867-5309'));
+```
+
 ### Locate details for a specific business by Yelp business id
 
 ```php

tests/YelpTest.php

@@ -62,6 +62,18 @@ public function test_It_Can_Search_Bars_In_Chicago()
         $this->assertEquals(3, count($results->businesses));
     }
 
+    public function test_It_Can_Search_By_Phone()
+    {
+        $phone = '(312) 822-2900';
+        $attributes = ['phone' => $phone];
+
+        $results = $this->client->searchByPhone($attributes);
+
+        $this->assertInstanceOf('stdClass', $results);
+        $this->assertNotEmpty($results->businesses);
+        $this->assertEquals(1, count($results->businesses));
+    }
+
     public function test_It_Can_Set_Defaults()
     {
         $default_term = 'stores';