feat: implement Pomodoro Timer with background audio support

submissions/pomodoro-timer/README.md

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+# Pomodoro Timer Solution
+
+Bounty: https://github.com/AkongaLabs/OSS-bounties/issues/1
+
+## Solution Overview
+
+Single HTML file implementation of a Pomodoro timer with reliable background audio notifications.
+
+## Features Implemented
+
+### Core Functionality
+- Configurable timer input (1-999 minutes)
+- MM:SS format countdown display
+- Start/Pause/Reset controls
+- Notification sound on completion
+- Auto-reset to original time after completion
+
+### Critical: Background Audio
+- Web Audio API for background playback
+- Sound plays even when tab is minimized/background
+- Audio scheduled at start time (not dependent on throttled timers)
+
+### Input Validation
+- Range validation (1-999 minutes)
+- Whole number validation
+- Clear error messages
+
+### Error Handling
+- Graceful degradation if audio fails
+- Chrome permission recovery instructions
+- Persistent "sound blocked" indicator
+
+### Accessibility
+- Keyboard navigation (Tab, Space, R key)
+- ARIA labels on all controls
+- Screen reader friendly
+- Good color contrast
+
+### Visual Feedback
+- Running/Paused/Ready states
+- Sound status indicator
+- Visual pulse animation on completion
+
+## Testing
+
+All test scenarios passed:
+1. Background audio plays when tab is minimized
+2. Timer continues when tab is inactive
+3. Graceful permission handling
+4. Input validation
+
+## Usage
+
+1. Open pomodoro-timer.html in Chrome
+2. Set timer duration (1-999 minutes)
+3. Click Start
+4. Timer will notify with sound when complete
+
+## Technical Notes
+
+- Single HTML file with embedded CSS/JS
+- No external dependencies
+- Uses Web Audio API for reliable background audio
+- Target: Chrome desktop
+
+## Bounty Payment
+
+Binance (USDT/USDC) - $200