Update README.md

README.md

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 # To_Do_Application
 This application is used to save the list of task you need to accomplish.
 The app is made using SQLite database and the tasks are stored in the internal storage of your device.
-Use the chechbox to mark the task as done.
+Use the checkbox to mark the task as done.
 The edit task feature works on right swiping the task.
 The delete task feature works on left swiping the task.
 Use the search icon on the top right to search a particular task.