feat: add Hash Generator tool with MD5, SHA-1, SHA-256, SHA-512 support

[rickyzakariap]

• Add comprehensive hash generation tool supporting multiple algorithms
• Implement single hash and batch hash generation modes
• Add file upload support for text files (max 10MB)
• Include copy to clipboard functionality for all results
• Add color-coded hash results with timestamps
• Implement proper error handling and loading states
• Use Web Crypto API for SHA algorithms (SHA-1, SHA-256, SHA-512)
• Add demo MD5 implementation with security warnings
• Follow existing codebase patterns and UI consistency
• Include comprehensive documentation and README

Features:

• Tabbed interface for single vs batch generation
• File drag-and-drop support
• Sample text functionality
• Clear/reset functionality
• Responsive design matching existing tools
• TypeScript with proper type definitions

Description

Please provide a clear and concise description of what this pull request achieves.

• What was the problem?
• What is the solution?
• Are there any side effects or new dependencies?

Related Issue

Fixes #

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code refactor or performance improvement
• Other (please describe):

Checklist

• I have read the project's CONTRIBUTING.md file.
• I have tested my changes locally.
• My code follows the style guidelines of this project.
• I have added comments to my code, particularly in hard-to-understand areas.
• I have updated the documentation accordingly.
• My changes generate no new warnings.

[ahammadabdullah]

@rickyzakariap hi, Please add an appropriate icon in sidebar , Generate all hash button's margin doesn't look good. and remove the left margin in unordered list.
and dont change anything in readme.