PHP file manager and editor using existing JS markdown editor

I would like a script that performs as a simple PHP file manager (add, edit, delete .txt files) in a directory on a webserver. When editing the text files, I would like for the script to use an existing markdown editor ([login to view URL]). Why? I need to see a list of text files in a particular directory. These are created with markdown, and I would like to edit them in a nice way, which is the need for the markdown editor as mentioned above. I would like for the script(s) to be as minimal as possible - I dont want to be adding lots of PHP files to my existing project. Please, only bid on this job if you are excellent at PHP and understand what markdown is - and you have great ratings already. Bids from programmers only, not companies that do many different things. Thanks J