Added new blog - Mastering Design Patterns in Java

[DharshiBalasubramaniyam]

Fixes #1512

Description

I have added a new blog which is about design patterns in java. In this article, I had delve into some of the most important design patterns that every developer should be familiar with. I have explored their principles, why they’re useful, and how you can use them in real projects.
1.singleton
2. adapter
3. builder
4. factory
5. decorator
6. observer

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Security enhancement
• Other (specify): _______________

Screenshots / Videos (if applicable)

[Attach any relevant screenshots or videos demonstrating the changes]

Checklist

• I have performed a self-review of my code.
• I have read and followed the Contribution Guidelines.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have commented my code, particularly in hard-to-understand areas.
• I have followed the code style guidelines of this project.
• I have checked for any existing open issues that my pull request may address.
• I have ensured that my changes do not break any existing functionality.
• Each contributor is allowed to create a maximum of 4 issues per day. This helps us manage and address issues efficiently.
• I have read the resources for guidance listed below.
• I have followed security best practices in my code changes.

We look forward to your contributions and appreciate your effort in helping us improve the project!

[github-actions]

Great job, @DharshiBalasubramaniyam! 🎉 Thank you for submitting your pull request to CodeHarborHub. We appreciate your contribution and enthusiasm! Our team will review it soon. If you have any questions or need further assistance, feel free to reach out. Thanks for contributing!

[deepsource-io]

Here's the code health analysis summary for commits c58c16e..bff9b4a. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[ajay-dhangar]

Done