Add example solution for Tip Calculator App (#325)

[suryaprakash0010]

Description #325

This PR adds a complete Tip Calculator example solution for issue #325. The application demonstrates fundamental JavaScript concepts including DOM manipulation, event handling, and input validation.

Features Implemented

• Bill Amount Input: Numeric input field for bill total
• Tip Selection: Preset percentage buttons (10%, 15%, 20%, 25%) + custom percentage input
• Dynamic Calculations: Real-time tip and total amount calculation
• Split Bill Feature: Divide total among multiple people
• Input Validation: Client-side validation with visual feedback
• Animations: Smooth CSS transitions for result updates
• Responsive Design: Works on different screen sizes

Technical Implementation

• HTML: Semantic structure with proper accessibility
• CSS: Modern styling with gradients, animations, and hover effects
• JavaScript: Clean, commented code with:
  • Event-driven architecture
  • Input validation functions
  • DOM manipulation for results
  • Math calculations for tip amounts

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Project	Deployment	Preview	Comments	Updated (UTC)
learn-javascript	Ready	Preview	Comment	Oct 6, 2025 11:46pm

[sumn2u]

Closing this since there hasn’t been any activity for over a month. You’re welcome to reopen the PR anytime.