#267 - initial work for payments

pom.xml

...dlocker8/budgetmaster/controller/EmptyPageController.java

...eadlocker8/budgetmaster/controller/PaymentController.java

...in/java/de/deadlocker8/budgetmaster/entities/Payment.java

...dlocker8/budgetmaster/repositories/PaymentRepository.java

src/main/resources/application.properties

src/main/resources/languages/_de.properties

src/main/resources/languages/_en.properties

src/main/resources/templates/categories/categories.ftl

src/main/resources/templates/payments/payments.ftl