Add support for reading and writing different file types

[sweep-ai[bot]]

Description

This PR adds support for reading and writing different file types in the SimpleEditor application. The current implementation only supports text files (.txt), but this PR introduces support for .doc, .docx, .rtf, and .odt files.

Summary

• Added necessary libraries for handling different file types:
  • Apache POI for .doc and .docx files
  • RTFEditorKit class for .rtf files
  • Apache ODF Toolkit for .odt files
• Modified the openFile method in the FileOperations class to handle .doc, .docx, .rtf, and .odt files. The text from these files is properly loaded into the textPane.
• Modified the saveFile method in the FileOperations class to handle .doc, .docx, .rtf, and .odt files. The text from the textPane is properly saved into these files.
• Handled exceptions that might occur during file operations to prevent application crashes.

Please review and merge this PR to enable support for reading and writing different file types in the SimpleEditor application.

Fixes #6.

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