add GUI in todo list with task priority feature

[Devparihar5]

Type of change

• [ ] Added new project
• [ ] Bug fix
• [x] New features
• [x] Enhanced documentation

Changes proposed in this pull request

• Project name: ToDoList

• Short description: add GUI with the Prioritize tasks with different colors (High priority in red, Medium in orange, Low in green) and Set due dates for tasks and select them from a calendar view

Checklist

• [x] The code is Python 3 compatible
• [x] I have added relevant comments in my file to make the code understandable
• [x] I have added my project to a folder that includes all the necessary files

[github-actions[bot]]

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[Mrinank-Bhowmick]

Resolve conflicts