Add install.sh and update README

install.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+# install.sh — Install nas-ops scripts to /usr/local/bin
+# Usage : curl -fsSL https://raw.githubusercontent.com/GuiPoM/nas-ops/main/install.sh | bash
+
+set -euo pipefail
+
+REPO="GuiPoM/nas-ops"
+BRANCH="main"
+BASE_URL="https://raw.githubusercontent.com/${REPO}/${BRANCH}"
+INSTALL_DIR="/usr/local/bin"
+
+SCRIPTS=(
+    "nas-update-system"
+    "nas-upgrade-system"
+    "nas-docker-pull"
+    "nas-docker-up"
+    "nas-docker-prune"
+    "nas-update"
+)
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+CYAN='\033[0;36m'
+BOLD='\033[1m'
+RESET='\033[0m'
+
+echo -e "${BOLD}======================================${RESET}"
+echo -e "${BOLD}        nas-ops — Installer           ${RESET}"
+echo -e "${BOLD}======================================${RESET}"
+echo ""
+
+# Check root
+if [ "$(id -u)" -ne 0 ]; then
+    echo -e "${RED}Error: this script must be run as root.${RESET}"
+    exit 1
+fi
+
+# Check dependencies
+echo -e "${CYAN}Checking dependencies...${RESET}"
+for cmd in curl docker; do
+    if command -v "$cmd" > /dev/null 2>&1; then
+        echo -e "  ${GREEN}✅ ${cmd}${RESET}"
+    else
+        echo -e "  ${YELLOW}⚠ ${cmd} not found — some scripts may not work${RESET}"
+    fi
+done
+echo ""
+
+# Download and install scripts
+echo -e "${CYAN}Installing scripts to ${INSTALL_DIR}...${RESET}"
+for script in "${SCRIPTS[@]}"; do
+    echo -ne "  Downloading ${script}... "
+    if curl -fsSL "${BASE_URL}/${script}" -o "${INSTALL_DIR}/${script}"; then
+        chmod +x "${INSTALL_DIR}/${script}"
+        echo -e "${GREEN}✅${RESET}"
+    else
+        echo -e "${RED}❌ Failed${RESET}"
+        exit 1
+    fi
+done
+
+echo ""
+echo -e "${GREEN}✅ Installation complete.${RESET}"
+echo ""
+echo -e "Available commands:"
+for script in "${SCRIPTS[@]}"; do
+    echo -e "  ${CYAN}${script}${RESET}"
+done
+echo ""
+echo -e "Run ${BOLD}nas-update${RESET} to get started."