Added setup guide and launch tools

start-arcade.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -euo pipefail
+arcade_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+if ! command -v python3 >/dev/null 2>&1; then
+    echo 'Python 3 is required. Install it before starting Arcade Escape.' >&2
+    exit 1
+fi
+exec python3 "$arcade_root/tools/launch/launch.py" "$@"