Add automated install.sh script for Copilot for Xcode

[Copilot]

Users requested a way to install Copilot for Xcode automatically rather than following multi-step manual instructions.

Changes

install.sh (new)

Executable bash script that automates as much of the install flow as possible:

• Validates macOS 13+ (configurable via MIN_MACOS_MAJOR)
• Installs via brew install --cask copilot-for-xcode; gracefully falls back to manual download guidance if Homebrew is absent or fails
• Opens the app so it self-registers its launch agent
• Checks for Node.js, warns if missing
• Prints version-aware System Settings navigation path for the extension-enable step (differs across macOS 13/14/15)

One-command install:

bash <(curl -fsSL https://raw.githubusercontent.com/intitni/CopilotForXcode/main/install.sh)

README.md

Adds an Automated Install section above the existing manual steps, surfacing the one-liner prominently.

INSTALL_ES.md

Adds an Instalación Automática section in Spanish with the same one-liner and a note for users who already have the repo cloned (bash install.sh).

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

Pull request overview

This PR adds a clear project identification header to the Spanish installation documentation (INSTALL_ES.md), improving the file's discoverability and context. The header follows the same format as README.md and includes the project logo, a Spanish description identifying it as the GitHub project that enables GitHub Copilot as an agent within Xcode, and a link to the upstream repository.

Changes:

• Added header section with project logo and Spanish description to INSTALL_ES.md
• Included link to the upstream GitHub repository
• Demoted the original "Guía de Instalación en macOS" heading to H2 level for better document structure

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