docs: Update contributing.md to incorporate Contribution Guidelines

[monilpat]

Relates to:

No specific issue linked. Adding PR templates as part of process improvements.

Risks

Low: Adding templates and updating documentation does not impact code or production systems.

Background

What does this PR do?

This PR updates the CONTRIBUTING.md file to include details about the new PR templates. It informs contributors about the location of the templates and how to use them when creating a pull request.

What kind of change is this?

• Documentation update (non-breaking change).

Why are we doing this? Any context or related work?

To improve contributor onboarding and ensure a standardized process for submitting pull requests.

Documentation changes needed?

My changes require a change to the project documentation.
I have updated the CONTRIBUTING.md file to reflect the new templates.

Testing

Where should a reviewer start?

Review the changes made to the CONTRIBUTING.md file. Check that the instructions are clear and accurate.

Detailed testing steps

1. Navigate to the CONTRIBUTING.md file.
2. Confirm the added sections about PR templates.
3. Verify that the file points to the correct location of the PR templates in the repository.

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[sirkitree]

this is great, thank you!