Add installation script

Author: devm33

install.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+set -e
+
+# GitHub Copilot CLI Installation Script
+# Usage: curl -fsSL https://gh.io/copilot-install | bash
+#    or: wget -qO- https://gh.io/copilot-install | bash
+
+INSTALL_DIR="${INSTALL_DIR:-$HOME/.local/bin}"
+
+echo "Installing GitHub Copilot CLI..."
+
+# Detect platform
+case "$(uname -s)" in
+  Darwin*) PLATFORM="darwin" ;;
+  Linux*) PLATFORM="linux" ;;
+  *) echo "Error: Unsupported platform $(uname -s). For Windows, recommend using: winget install GitHub.Copilot" >&2 ; exit 1 ;;
+esac
+
+# Detect architecture
+case "$(uname -m)" in
+  x86_64|amd64) ARCH="x64" ;;
+  aarch64|arm64) ARCH="arm64" ;;
+  *) echo "Error: Unsupported architecture $(uname -m)" >&2 ; exit 1 ;;
+esac
+
+DOWNLOAD_URL="https://github.com/github/copilot-cli/releases/latest/download/copilot-${PLATFORM}-${ARCH}.tar.gz"
+echo "Downloading from: $DOWNLOAD_URL"
+
+DOWNLOAD_DIR="${HOME}/.copilot/"
+mkdir -p "$DOWNLOAD_DIR"
+
+# Download and extract
+cd "$DOWNLOAD_DIR"
+if command -v curl >/dev/null 2>&1; then
+  curl -fsSL "$DOWNLOAD_URL" | tar -xz
+elif command -v wget >/dev/null 2>&1; then
+  wget -qO- "$DOWNLOAD_URL" | tar -xz
+else
+  echo "Error: Neither curl nor wget found. Please install one of them."
+  exit 1
+fi
+
+if [ "$(id -u 2>/dev/null || echo 1)" -eq 0 ]; then
+  PREFIX="${PREFIX:-/usr/local}"
+else
+  PREFIX="${PREFIX:-$HOME/.local}"
+  mkdir -p "$INSTALL_DIR/bin"
+fi
+INSTALL_DIR="$PREFIX/bin"
+
+# Install binary
+if [ -f "copilot" ]; then
+  mv copilot "$INSTALL_DIR/copilot"
+  chmod +x "$INSTALL_DIR/copilot"
+  echo "✓ GitHub Copilot CLI installed to $INSTALL_DIR/copilot"
+else
+  echo "Error: copilot binary not found in tarball"
+  exit 1
+fi
+
+# Check if install directory is in PATH
+if [[ ":$PATH:" != *":$INSTALL_DIR:"* ]]; then
+  echo ""
+  echo "Warning: $INSTALL_DIR is not in your PATH"
+  echo "Add it to your PATH by adding this line to your shell profile:"
+  echo "  export PATH=\"\$PATH:$INSTALL_DIR\""
+fi
+
+echo ""
+echo "Installation complete! Run 'copilot help' to get started."