[FEATURE] Add new `flashcard` for the user by the user

[rezwancs]

Is your feature request related to a problem? Please describe.
Currently, we can't add new flashcard from the website.

Describe the solution you'd like
There should be a feature by which we can add a new flashcard.

Additional context
We should ensure first that the flashcard content storing to localstorage feature has been implemented ( issue #7)

[jason1985]

Is it ok if I work on this?
Also was there a specific design/interface that you prefer this feature to have?
Thanks.

[rezwancs]

@jason1985 actually we will be waiting for issue #7 to be finished first. Otherwise, we may rework the same feature. Meanwhile, I will be thinking about the UI.

[rezwancs]

Anyone can pick this task now.

[jason1985]

I'd like to work on this

[rezwancs]

@jason1985 Yes sure, please go ahead.🤩