Feat/hng 82 develop waitlist form to add user

[toonami2907]

Description

**Closes #82# Changes proposed

What were you told to do?

Implement a waitlist form with validation and style it using Tailwind CSS.

What did you do?

1. Created the WaitlistForm component with form validation.
2. Applied direct Tailwind CSS styles instead of global styles for the form and its elements.
3. Added error handling for invalid form submissions.
4. Updated the form to show a success message upon successful submission.

Check List (Check all the applicable boxes)

🚨Please review the contribution guideline for this repository.

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR are clear and explain the approach.
• I am making a pull request against the dev branch (left side).
• My commit message style matches our requested structure.
• My code additions will fail neither code linting checks nor unit tests.
• I am only making changes to files I was requested to.

Screenshots/Videos