Add install script and update installation docs

Author: tomLadder

LLMS.md

@@ -11,6 +11,14 @@ willhaben-cli is a command-line tool for creating and managing listings on willh
 1. User must have a willhaben.at account
 2. User must be logged in: `willhaben login`
 
+## Installation
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/tomLadder/willhaben-cli/main/install.sh | sh
+```
+
+Pre-built binaries are also available on the [Releases page](https://github.com/tomLadder/willhaben-cli/releases).
+
 ## Authentication
 
 ```bash

README.md

@@ -67,12 +67,18 @@
 
 ## Installation
 
-### Prerequisites
+### Quick Install (macOS / Linux)
 
-- [Bun](https://bun.sh) v1.0 or higher
+```bash
+curl -fsSL https://raw.githubusercontent.com/tomLadder/willhaben-cli/main/install.sh | sh
+```
+
+Pre-built binaries are also available on the [Releases page](https://github.com/tomLadder/willhaben-cli/releases).
 
 ### From Source
 
+**Prerequisites:** [Bun](https://bun.sh) v1.0 or higher
+
 ```bash
 # Clone the repository
 git clone https://github.com/tomLadder/willhaben-cli.git

docs/guide/installation.md

@@ -1,8 +1,18 @@
 # Installation
 
-## Prerequisites
+## Quick Install (macOS / Linux)
 
-- [Bun](https://bun.sh) v1.0 or higher
+```bash
+curl -fsSL https://raw.githubusercontent.com/tomLadder/willhaben-cli/main/install.sh | sh
+```
+
+This will automatically detect your OS and architecture, download the latest release binary, and install it to `/usr/local/bin`.
+
+## GitHub Releases
+
+Pre-built binaries for macOS, Linux, and Windows are available on the [Releases page](https://github.com/tomLadder/willhaben-cli/releases).
+
+Download the binary for your platform, make it executable (`chmod +x`), and move it to a directory in your `PATH`.
 
 ## From Source
 

install.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+set -e
+
+REPO="tomLadder/willhaben-cli"
+INSTALL_DIR="/usr/local/bin"
+BINARY_NAME="willhaben"
+
+# Detect OS
+OS="$(uname -s)"
+case "$OS" in
+  Darwin)  OS="darwin" ;;
+  Linux)   OS="linux" ;;
+  MINGW*|MSYS*|CYGWIN*) OS="windows" ;;
+  *) echo "Unsupported OS: $OS" && exit 1 ;;
+esac
+
+# Detect architecture
+ARCH="$(uname -m)"
+case "$ARCH" in
+  x86_64|amd64)  ARCH="x64" ;;
+  arm64|aarch64)  ARCH="arm64" ;;
+  *) echo "Unsupported architecture: $ARCH" && exit 1 ;;
+esac
+
+TARGET="${OS}-${ARCH}"
+
+# Windows not supported via this script
+if [ "$OS" = "windows" ]; then
+  echo "Windows is not supported by this installer."
+  echo "Download the binary manually from: https://github.com/$REPO/releases"
+  exit 1
+fi
+
+# Get latest release tag
+echo "Fetching latest release..."
+TAG="$(curl -fsSL "https://api.github.com/repos/$REPO/releases/latest" | grep '"tag_name"' | sed 's/.*"tag_name": *"//;s/".*//')"
+
+if [ -z "$TAG" ]; then
+  echo "Failed to fetch latest release. Check https://github.com/$REPO/releases"
+  exit 1
+fi
+
+DOWNLOAD_URL="https://github.com/$REPO/releases/download/$TAG/willhaben-$TARGET"
+
+echo "Downloading willhaben $TAG for $TARGET..."
+TMPFILE="$(mktemp)"
+curl -fsSL "$DOWNLOAD_URL" -o "$TMPFILE"
+chmod +x "$TMPFILE"
+
+echo "Installing to $INSTALL_DIR/$BINARY_NAME (may require sudo)..."
+if [ -w "$INSTALL_DIR" ]; then
+  mv "$TMPFILE" "$INSTALL_DIR/$BINARY_NAME"
+else
+  sudo mv "$TMPFILE" "$INSTALL_DIR/$BINARY_NAME"
+fi
+
+echo "willhaben $TAG installed successfully! Run 'willhaben --help' to get started."