Add setup script for easy contibutor onboarding

Author: birdcar

scripts/setup.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+if ! command -v uv &>/dev/null; then
+  echo "Can't find uv, please install uv or ensure it's available in your PATH before attempting setup."
+  exit 1
+fi
+
+uv sync --dev