Add Pull Request (PR) Template

Description:
Currently, the repository does not have a Pull Request (PR) template. This makes it harder for contributors to provide consistent information when opening PRs.

Proposed Solution:
Add a PR template file at .github/pull_request_template.md.

The template should include:
Description of changes
Related issues (Fixes #issue)
Screenshots (if applicable)
Type of change (Bug fix, Feature, Enhancement, Documentation)
Checklist (self-review, code style, documentation update)

Benefits:
Ensures all PRs have consistent structure.
Helps maintainers review PRs faster.
Improves contributor experience and professionalism of the project.