communication with the frontend works

src/main/java/de/telekom/silly_game/GameController.java

@@ -0,0 +1,28 @@
+package de.telekom.silly_game;
+
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+@RestController
+@CrossOrigin(origins = "http://localhost:4200")
+@RequestMapping("/game")
+public class GameController {
+
+    @GetMapping("/start")
+    public String startGame() {
+        return "Game started!";
+    }
+
+    private AtomicInteger jumpCount = new AtomicInteger(0);
+
+    @GetMapping("/jump")
+    public Map<String, Integer> registerJump() {
+        int total = jumpCount.incrementAndGet();
+        total = total/2;
+        System.out.println(total);
+        return Collections.singletonMap("totalJumps", total);
+    }
+}