Creates FileHandler class(to be completed)
Merge with online repository.# Please enter a commit message to explain why this merge is necessary,# especially if it merges an updated upstream into a topic branch.## Lines starting with '#' will be ignored, and an empty message aborts# the commit.
Creates getListFromFile and writeToFile methods
Completes category-related methods in TaskItem class
Tests part of read from file
Merges from origin