Add basic CONTRIBUTING.md file

[Copilot]

Adds contributor guidelines for the programets R package.

• Issue reporting: Bug report template with required info (sessionInfo, repro steps)
• PR workflow: Fork → branch → test → submit process
• Code style: References .lintr config (2-space indent) and tidyverse guide
• Development: Basic setup commands with pointer to DEVELOPER.md for advanced config
• Code of Conduct: Links to existing CODE_OF_CONDUCT.md

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add basic CONTRIBUTING.md file</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add basic CONTRIBUTING.md file #26

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.