[FEATURE] Create Hint Button

[YuriDevAT]

Description

As a User I want to see a button with the text HINT in it. The button should be fully accessible.
The button should appear beneath the container which surrounds the current app.
The button should keep its default styling (no extra CSS needed).
The button does not need functionality (no JavaScript needed).

Useful resources

MDN documentation on button: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button
MDN documentation on text-transform: https://developer.mozilla.org/en-US/docs/Web/CSS/text-transform

### Tasks
- [ ] Add a button beneath the container element (`<div class="container"></div>`)
- [ ] Use semantic HTML to create the button
- [ ] Give the button a type
- [ ] The uppercase text **HINT** should be created using CSS
- [ ] Add CSS to `style.css` and give the button the class `button-hint`

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### SUGGESTED FEATURES

4. Hints that are revealed when the user clicks a button. (I know, it’s a quiz, so maybe we should not help, but sharing the idea anyway in case it might inspire related features.) For example: total number of tags, number of tags that start with a certain letter, which letters of the alphabet are NOT used to start a tag, etc.

Originally posted by @CorinaMurg in #20 (comment)

[rituraj12797]

i would like to contribute

[YuriDevAT]

As the label points out this ticket still needs some updates. I can assign you if these updates are made, but cannot guarantee if this will happen during Hacktoberfest.

[Tashuuuu]

Can I work on it?

[YuriDevAT]

Sure @Tashuuuu, please go ahead

[YuriDevAT]

Hi @Tashuuuu how are you doing? Two weeks have passed with no PR from you. Are you still working on this issue? Otherwise, the issue will be unassigned, as written in the contribution guideline.

[ShivangiRai1310]

Is the issue open for contribution? If so can I work on this?

[YuriDevAT]

Hi @ShivangiRai1310 . The issue is already assigned.

@CorinaMurg Coming to think of it, is this issue still relevant for our current state of the app? 🤔