Para rodar:
./gradlew bootRun
Endpoints:
GET - localhost:8080/users
GET - localhost:8080/users/{username}
POST - localhost:8080/users
{
"username": "",
"name": "",
"city": ""
}
DELETE - localhost:8080/users/{username}
PUT - localhost:8080/users/{username}
{
"username": "",
"name": "",
"city": ""
}