Add install script and quickstart section

install.sh fetches the latest release dynamically from the GitHub API,
so it never needs updating when new versions are published.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -10,7 +10,22 @@ Collaborator is an end-to-end environment for agentic development. Terminals, co
 
 The app is early-stage and in active development. macOS only for now.
 
-**[Download the latest release](https://github.com/collaborator-ai/collab-public/releases/latest)**
+## Install
+
+**[Download the latest release](https://github.com/collaborator-ai/collab-public/releases/latest)** (macOS, Apple Silicon)
+
+Or install from the command line:
+
+```sh
+curl -fsSL https://raw.githubusercontent.com/collaborator-ai/collab-public/main/install.sh | bash
+```
+
+## Quickstart
+
+1. Open Collaborator
+2. Add a workspace — click the workspace dropdown in the navigator and choose "Add workspace", or press Cmd+Shift+O, then select a local folder
+3. Double-click the canvas to create a terminal, and start an agent
+4. Drag files from the navigator onto the canvas to open them as tiles alongside your running agents
 
 ***
 

install.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -euo pipefail
+
+REPO="collaborator-ai/collab-public"
+INSTALL_DIR="/Applications"
+TMP_DIR=$(mktemp -d)
+
+cleanup() { rm -rf "$TMP_DIR"; }
+trap cleanup EXIT
+
+echo "Fetching latest release..."
+ZIP_URL=$(curl -fsSL "https://api.github.com/repos/${REPO}/releases/latest" \
+  | grep -o '"browser_download_url": *"[^"]*arm64-mac\.zip"' \
+  | head -1 \
+  | cut -d'"' -f4)
+
+if [ -z "$ZIP_URL" ]; then
+  echo "Error: could not find a macOS ARM64 zip in the latest release." >&2
+  exit 1
+fi
+
+echo "Downloading $(basename "$ZIP_URL")..."
+curl -fSL --progress-bar "$ZIP_URL" -o "$TMP_DIR/Collaborator.zip"
+
+echo "Installing to ${INSTALL_DIR}..."
+ditto -xk "$TMP_DIR/Collaborator.zip" "$INSTALL_DIR"
+
+echo "Done. Opening Collaborator..."
+open "$INSTALL_DIR/Collaborator.app"