README.md

1. Run Application.java
2. Open swagger-ui http://localhost:8080/springfox/swagger-ui/index.html?urls.primaryName=my_openapi#/default/getBySsku
3. Look at example sample. It contains null as example in keys, but it doesn't expect.

{
  "keys": [
    null
  ],
  "warehouseIds": [
    172
  ],
  "date": "2022-01-11"
}