upload, rename api parameters modified, test cases, sample app updated

Author: msheheryar1

sample/sample.php

@@ -8,13 +8,9 @@
     exit;
 }
 
-// $public_key = 'your_public_key';
-// $your_private_key = 'your_private_key';
-// $url_end_point = 'https://ik.imagekit.io/demo';
-$public_key = 'public_Qp7LRq6BgZoqzQAzRpbUe2o68II=';
-$your_private_key = 'private_9d/vrR10y11DjFWsmKFb+ra2sHE=';
-$url_end_point = 'https://ik.imagekit.io/0wbiqzorc';
-
+$public_key = 'your_public_key';
+$your_private_key = 'your_private_key';
+$url_end_point = 'https://ik.imagekit.io/demo';
 
 $sample_file_url = 'https://cdn.pixabay.com/photo/2020/02/04/22/29/owl-4819550_960_720.jpg';
 $sample_file_path = '/sample_image.jpg';