update README.md

Author: rheien

README.md

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 # Spring-Boot-REST-API-Example-Volleyballteam
 This application will explore how to create REST APIs for CRUD operations using Spring Boot framework.
+
+To start the application, run the following command in your terminal:
+``` 
+mvn spring-boot:run
+```
+
+## How to use the application
+
+With the application running, open your browser and navigate to http://localhost:8080/swagger-ui/index.html. 
+You will see the Swagger UI page from where you can test the REST APIs.
+
+Of course, you can also use Postman or any other REST client to test the APIs.
+The REST API can be accessed at http://localhost:8080/api/teams.
+
+Following endpoints are available in the application:
+- GET /api/teams - Get all teams
+- GET /api/teams/{name} - Get team by name
+- GET /api/teams/players - Get all players
+- GET /api/teams/players/{id} - Get player by id
+- GET /api/teams/{name}/players - Get all players by team name
+- POST /api/teams/team-management - Create or update a team 
+- POST /api/teams/team-management/players - Add a player to a team
+- DELETE /api/teams/team-management/players - Remove a player from a team