Exercise: TODO

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Extend the TODO applications by the following:

• Add Input validation to the TODO, require the text to be at least 3 characters long.
• Save the timestamp of the creation of the item.
• Allow the setting of a due-date for the item.
• Allow the user to set priority level 1-5 using a 'select' element.
• Allow the user to type in some longer text in a 'textarea' and save that too.
• Allow editing the item.