fixed time calculations

fixed turnaround time calculation

fixed round robin schedular algo

Update test_rr.py

Create test_rr.py

Update test_sjf.py

Update test_sjf.py

fixed test_sjf.py

Update test_sjf.py

test case fix

fixed test case

test case for sjf scheduling algo

fixed import

added test for fcfs algo

Create python-app.yml

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Update README.md

screenshot updated

added grant charts

fixed the GUI with additional features

Update README.md

added burst time, arrival time, and priority

added edit or remove task buttons

Gantt chart to provide gui of scheduling process

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Create .gitignore

gui image added

implemented tkinter gui

tkinter gui added