Added Interface for EstateAgents and Estates

Added the Command Line Interface for EstateAgents and Estates without
functionality.
Added Data Structures for Estates, Apartments and Houses.

02/src/de/dis2017/data/Apartment.java

@@ -0,0 +1,40 @@
+package de.dis2017.data;
+
+public class Apartment extends Estate{
+	int floor;
+	int rent;
+	int rooms;
+	boolean balcony;
+	boolean builtinKitchen;
+	
+	public int getFloor() {
+		return floor;
+	}
+	public void setFloor(int floor) {
+		this.floor = floor;
+	}
+	public int getRent() {
+		return rent;
+	}
+	public void setRent(int rent) {
+		this.rent = rent;
+	}
+	public int getRooms() {
+		return rooms;
+	}
+	public void setRooms(int rooms) {
+		this.rooms = rooms;
+	}
+	public boolean isBalcony() {
+		return balcony;
+	}
+	public void setBalcony(boolean balcony) {
+		this.balcony = balcony;
+	}
+	public boolean isBuiltinKitchen() {
+		return builtinKitchen;
+	}
+	public void setBuiltinKitchen(boolean builtinKitchen) {
+		this.builtinKitchen = builtinKitchen;
+	}
+}