feat(TaskManager): implement mark-as-done toggle and delete task#72

Aakash3640 wants to merge 1 commit intoakebu6:mainakebu6/Android-Beginner-Projects:mainfrom

Aakash3640:feat/taskmanager-mark-deleteAakash3640/Android-Beginner-Projects:feat/taskmanager-mark-deleteCopy head branch name to clipboard