Add run-tests script

run-tests.sh

+#!/bin/sh
+set -e
+
+if [ "$1" = "macos" ]; then
+
+  echo "\n\033[1;32m▶ Running package tests on macOS...\033[0m"
+  set -o pipefail && swift test 2>&1 | ./xcbeautify
+
+elif [ "$1" = "ios" ]; then
+
+  echo "\n\033[1;32m▶ Running package tests on iOS Simulator...\033[0m"
+  set -o pipefail && xcodebuild -scheme 'xx-client-ios-db-Package' -sdk iphonesimulator -destination 'platform=iOS Simulator,OS=16.0,name=iPhone 14' test | ./xcbeautify
+
+else
+
+  echo "\n\033[1;31m▶ Invalid option.\033[0m Usage:"
+  echo "  run-tests.sh macos        - Run package tests on macOS"
+  echo "  run-tests.sh ios          - Run package tests on iOS Simulator"
+  exit 1
+
+fi