add tutorial for making cells with utility tools

[audrey01mit]

also edit the link once done in doc for contributors 0.What and where to add

[audrey01mit]

https://qnn.mit.edu/wordpress/wp-admin/post.php?post=30565&action=edit https://qnn.mit.edu/wordpress/wp-admin/post.php?post=30576&action=edit https://qnn.mit.edu/wordpress/wp-admin/post.php?post=30609&action=edit https://qnn.mit.edu/wordpress/wp-admin/post.php?post=30614&action=edit Check these blog post that could be rephrased into tutorials