📝 Update Readme

README.md

@@ -131,19 +131,30 @@ You can run the application in dev mode using:
 
 ## API testing
 
+### 🧪 Sample dataset
+
+You can find a sample dataset at `docs/sample-dataset/`. Each JSON file contains a collection.
+
+To load the `moves` collection into an existing MongoDB cluster, you may use [MongoDB Shell ("mongosh")](https://www.mongodb.com/docs/mongodb-shell/) to run
+```shell script
+mongoimport --uri=mongodb+srv://<username>:<password>@<cluster>.<node>.mongodb.net/<databasename> --collection=moves --file=./docs/sample-dataset/moves.json
+```
+
 ### 🏴‍☠️ SwaggerUI
 
 Thanks to this project's OpenAPI specs, you can explore the API in a lot of ways.
 A popular choice is SwaggerUI -- after you run the app, just go to http://localhost:8080/q/swagger-ui and have fun.
 
 ⚠️ Unfortunately, Swagger or Quarkus or SmallRye adds the field `id` to all request examples, but in fact ***you should
-not include id** when you POST a new document.*
+NOT include id** when you POST or UPDATE a new document.* The app takes care of it for you. Same thing for the field `species` with `Pokemong` documents.
 
 ### 🩺 API testing tools
 
 You can use an API testing tool such as [Postman](https://www.postman.com/)
 or [Insomnia](https://insomnia.rest/) to test this app.
 
+If you use Postman, you can even import `docs/postman_collection.json`, designed to work with the `🧪 Sample dataset`.
+
 ### 📱 Front end (later)
 
 Moving forward, the front end part of this app -- a different project -- might also come into play for trying out this