Add more rent info

src/App.js

@@ -23,6 +23,7 @@ function App() {
 
   const [selectedFlat, setSelectedFlat] = useState();
   const [selectedRoom, setSelectedRoom] = useState();
+  const [numAdults, setNumAdults] = useState(1);
 
   const [rent, setRent] = useState(0);
 
@@ -73,8 +74,8 @@ function App() {
             <Heading>Wohnung</Heading>
             <Box></Box>
 
-            <FlatSelectionCard setSelectedFlat={setSelectedFlat} onRoomSelected={setSelectedRoom} />
-            <FlatDetailsCard flat={selectedFlat} room={selectedRoom} />
+            <FlatSelectionCard setSelectedFlat={setSelectedFlat} onRoomSelected={setSelectedRoom} onNumAdultsSelected={setNumAdults} />
+            <FlatDetailsCard flat={selectedFlat} room={selectedRoom} numAdults={numAdults} />
 
             <Heading>Selbsteinschätzung</Heading>
             <Box></Box>