documented some more

...rvice/src/main/java/at/tuwien/endpoints/DataEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/TableEndpoint.java

.../java/at/tuwien/endpoint/DataEndpointIntegrationTest.java

...c/test/java/at/tuwien/endpoint/TableEndpointUnitTest.java

...st/java/at/tuwien/service/DataServiceIntegrationTest.java

...t/java/at/tuwien/service/TableServiceIntegrationTest.java

...src/test/java/at/tuwien/service/TableServiceUnitTest.java

.../src/main/java/at/tuwien/service/MessageQueueService.java

...ervices/src/main/java/at/tuwien/service/TableService.java

...s/src/main/java/at/tuwien/service/impl/JdbcConnector.java

...rc/main/java/at/tuwien/service/impl/MariaDataService.java

...src/main/java/at/tuwien/service/impl/RabbitMqService.java

...rc/main/java/at/tuwien/service/impl/TableServiceImpl.java