chore: Add PR/issue templates, code of conduct & update contributing guide

[mdhaarishussain]

Summary

Adds GitHub community health files — PR template, issue templates, and a Code of Conduct — so the project is ready for open-source contributions.

Changes

• .github/PULL_REQUEST_TEMPLATE.md — checklist with type-of-change labels, testing steps, and screenshot section
• .github/ISSUE_TEMPLATE/bug_report.md — structured bug report with environment, API details, and repro steps
• .github/ISSUE_TEMPLATE/feature_request.md — feature request with problem/solution/use-case sections
• CODE_OF_CONDUCT.md — Contributor Covenant v2.1
• CONTRIBUTING.md — updated with Code of Conduct reference and corrected repo clone URL

Why

Every serious open-source project needs these. They improve contributor experience and make it easier to triage issues and review PRs.

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Co-authored-by: SK Faizanuddin faizanuddinsk56@gmail.com
Co-authored-by: Md Haaris Hussain mdhaarishussain@gmail.com

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