Good frist issue

[Jayesh45-master]

Fixes #725

This pull request extends the plugin documentation by adding a new page with practical, real-world usage examples.
The goal is to help new users quickly understand how the plugin can be used in common Jenkins setups.

The documentation is written in Markdown and is compatible with the existing Docsify-based GitHub Pages setup.

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Testing done

This change was tested manually by:

• Creating a new documentation file under the /docs directory
• Verifying Markdown rendering locally
• Reviewing the content structure and examples for clarity and correctness
• Ensuring the new documentation file follows the existing documentation conventions

No automated tests are included since this change only affects documentation and does not modify runtime code.

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Screenshots (UI changes only)

N/A

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Proposed changelog entries

• Extend plugin documentation with practical usage examples

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Proposed changelog category

/label skip-changelog

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Proposed upgrade guidelines

N/A

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Submitter checklist

• The issue is well-described.
• The changelog entries and upgrade guidelines are appropriate for the audience affected by the change.
• There is an explanation as to why this change has no automated tests.
• UI changes do not introduce regressions when enforcing the current default rules of the Content Security Policy Plugin.

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Desired reviewers

@jenkinsci/core-pr-reviewers

[welcome]

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