Simple text editor. The program has GUI based on Swing. It can create, open and save
ASCII text files. It has the following elements:
1. A menu bar which contains a menu File. The menu File contains the options: New, Open,
Save, Save As.
2. A text area where the user can edit the text file.
3. A check box Reverse. When the checkbox is chosen, the file is saved with its lines in reversed