Add Code of Conduct, update documentation, and enhance CI/CD pipeline details

[marko-stanojevic]

Description

This pull request introduces comprehensive documentation and process improvements for the PSScriptModule project, focusing on development workflow, build and test automation, CI/CD pipeline, publishing, maintenance, and community standards. The updates provide clear guidance for contributors and ensure robust automation and quality control throughout the module lifecycle.

Documentation and Workflow Enhancements

• Added detailed guides for creating, testing, and exporting new functions, including examples for function and test files, and instructions for updating the module manifest. (docs/development.md)
• Documented build tasks and usage of Invoke-Build, covering cleaning, building, testing, code analysis, security scanning, documentation generation, publishing, and build configuration options. (docs/building.md)
• Provided instructions for generating help files with PlatyPS, including markdown and MAML formats, and examples for accessing help in PowerShell. (docs/generating-help.md)
• Added testing documentation detailing how to run unit, analysis, and security tests, including code coverage and output formats. (docs/testing.md)

Automation and CI/CD Improvements

• Introduced a comprehensive CI/CD pipeline guide, describing workflow structure, triggers, build types, semantic versioning strategy, and commit message conventions for automated releases. (docs/ci-cd.md)
• Documented publishing process to PowerShell Gallery, including manual and automated methods, secret configuration, and manual workflow dispatch options. (docs/publishing.md)
• Added automated maintenance workflow documentation for artifact and workflow run cleanup, with configurable retention and scheduling. (docs/maintenance.md)

Community and Contribution Guidelines

• Added a new Code of Conduct to set expectations for behavior, standards, and enforcement responsibilities within the community. (.github/CODE_OF_CONDUCT.md)
• Updated the contributing guide to reflect the correct project name and reinforce adherence to the Code of Conduct. (CONTRIBUTING.md)