Add workflow: .github/workflows/auto-close-duplicates.yml

[matvix90]

Description
Create an automation that detects duplicate issues (by title similarity or linked issue) and auto-closes or marks them as duplicate with a comment pointing to the original.

Why
Reduce noise and consolidate issue tracking.

Acceptance criteria

• File .github/workflows/auto-close-duplicates.yml added
• Runs on issue opened and uses a configured similarity threshold or searches for matching title/labels
• Adds a comment linking to the existing issue and applies a "duplicate" label or closes the duplicate

Testing

• Open a new issue with same title as an existing issue → workflow comments and applies "duplicate" label.

[rexdivakar]

Hi @matvix90 can u assign this issue to me ?

[matvix90]

@rexdivakar go for it!

[rexdivakar]

Hey @matvix90 the issue has been addressed
#73