Minor - adding db changes

main/work/add_document.php

@@ -135,6 +135,8 @@ CREATE TABLE IF NOT EXISTS c_student_publication_rel_user (
 );
 
 
+CREATE TABLE IF NOT EXISTS c_student_publication_comment (id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,  work_id INT NOT NULL,  c_id INT NOT NULL,  comment text,  user_id int NOT NULL,  sent_at datetime NOT NULL) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
 
 */