Will add content to the end of the file given. This is part of the file system functions. Improper use of the file system functions will result in loss of data.
Path and file name of a file to be affected by the function. File path is relative to the set web folder starting with a forward slash /.
Content that will be entered into the end file.
Will return TRUE or FALSE after run.
s.file_add("/file.txt","Just a new bit of info")