Add OpenAPI client generator NPM script

package.json

@@ -6,7 +6,8 @@
     "start": "ng serve",
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
-    "test": "ng test"
+    "test": "ng test",
+    "generate-openapi": "npx openapi-generator-cli generate -i http://localhost:8080/q/openapi -g typescript-angular -o src/app/openapi --additional-properties fileNaming=kebab-case --generate-alias-as-model"
   },
   "private": true,
   "dependencies": {