Remove duplicate files and add skills.js implementation

[Copilot]

Repository contained duplicate files with inconsistent naming that created ambiguity about which files were authoritative.

Changes

• Removed duplicate package configuration: Deleted package.JSON (incorrect uppercase extension) keeping canonical package.json
• Removed duplicate requirements: Deleted requirement.txt (typo) keeping requirements.txt
• Removed empty config stub: Deleted empty pre-commit-config.yaml duplicate of .pre-commit-config.yaml
• Added skills.js implementation: Populated empty file with calculateNumbers function per README tutorial

function calculateNumbers(var1, var2) {
    return var1 + var2;
}

module.exports = { calculateNumbers };

Repository now has single canonical version of each configuration file and provides working example code for the Copilot tutorial.

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