Add example Thunderbird extension for OAuth2 authentication

[Aravinda-HWK]

📌 Description

Add the Thunderbird extension template with the README.md file.

• Closes [TASK] Add Example Thunderbird Extension for OAuth2 #310

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🔍 Changes Made

• Add manifest.json template file
• Create README.md file

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✅ Checklist (Email System)

• Core services tested (SMTP, IMAP, mail storage, end-to-end delivery)
• Security & compliance verified (auth via Thunder IDP, TLS, DKIM/SPF/DMARC, spam/virus filtering)
• Configuration & deployment checked (configs generated, Docker/Compose updated)
• Reliability confirmed (error handling, logging, monitoring)
• Documentation & usage notes updated (README, deployment, API)

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🧪 Testing Instructions

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📷 Screenshots / Logs (if applicable)

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⚠️ Notes for Reviewers

When we add the scripts for the thunder, we need to update the manifest.json file as well.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces an example Thunderbird extension designed to facilitate OAuth2 authentication. It provides a foundational manifest.json template and a comprehensive README.md guide, enabling users to understand and implement OAuth2 integration within Thunderbird for enhanced email security and authentication.

Highlights

• New Thunderbird OAuth Example: Added a template manifest.json file for a Thunderbird OAuth provider extension.
• Documentation for OAuth Example: Created a README.md file with instructions for setting up, packaging, installing, and verifying the Thunderbird OAuth extension.

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[gemini-code-assist]

Code Review

This pull request introduces an example for a Thunderbird OAuth provider extension, including a manifest.json configuration and a README.md with setup instructions. Feedback suggests improving the packaging instructions in the README.md to be more robust for users who might extend the example with additional files.

[maneeshaxyz]

LGTM.