DX-4048 Add Generate Script (#95)

Author: ckoegel

generate.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -euo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+npx --yes @openapitools/openapi-generator-cli generate \
+  -i bandwidth.yml -g php-nextgen -c openapi-config.yml -o . "$@"