Added Hashing Message Calculator

[ShreeluSantosh]

Fixes Issue🛠️

Closes #1369

Description👨‍💻

• Add new calculator - Hashing Message Calculator
• Created directory in /Calculators with 4 files - index.html, style.css, script.js and README.md
• Created a subdirectory inside /Calculators/Hashing-Message-Calculator, assets with background.jpg
• Modify index.html for the main page to include the Hashing Message Calculator in the Calculator Section

Type of Change📄

• [X] New feature (non-breaking change which adds functionality)

Checklist✅

• [X] I am an Open Source contributor
• [X] I have performed a self-review of my code
• [X] My code follows the style guidelines of this project
• [X] I have commented on my code, particularly in hard-to-understand areas

Screenshots/GIF📷

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[ShreeluSantosh]

Linked Issue: #1369

[Nihal4777]

@Rakesh9100 This PR can be merged.

[github-actions[bot]]

Congrats, Your pull request has been successfully merged 🥳🎉 Thank you for your contribution to my project 🚀 Keep Contributing!! ✨ @ShreeluSantosh