Readme: rephrased the 'how to' section; added label before descriptio…

[Momro]

Previous list:

• To add a new task enter:
  • A title (e.g., “Clean Dryer Vent”)
  • How often it needs to be done
  • Select the interval period (Defaults to days)
  • The last time you did it (Optional. If omitted will be today)
  • Select an NFC tag (Optional. Will mark the task complete when scanned)
  • Select an icon (Optional)
  • Click Add Task

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New list:

• To add a new task, enter:
  • Task Title: A title, e.g. “Clean Dryer Vent”
  • Interval (integer): How often it needs to be done
  • Interval Type (selector): Select the interval period; days (default), weeks, months
  • Last Performed (optional): The last time you did it (default: today)
  • Icon (optional): Select an icon
  • Label (optional): add label
  • Tag (optional): select an NFC tag; will mark the task complete when scanned
  • Click Add Task