added functionality to calculate the read time

single-post.php

@@ -49,7 +49,10 @@ get_header();
                                 </clipPath>
                             </defs>
                         </svg>
-                       
+                        <?php
+                        $post_content = get_the_content();
+                        $reading_time = calculate_reading_time($post_content);
+                        echo $reading_time; ?> mins read
                     </div>
                     <div class="d-flex views">
                         <svg class="me-2" width="24" height="24" viewBox="0 0 24 24" fill="none"