starting new demo spring-mvc
define first steps to implement the application
define first step
implement step 2: create an empty controller
add source code sample to this step
step 3: add an integration test to simulate http requests with MockMVC, of Spring MVC
step 3: add more expectations to the integration test
step 3: add a failing test to implement -> requesting a property by 'id' will return an object with property data (city, address and price)
link the 'home page' to the current demo
add 'Property' domain class