Implement dummy TokenController

src/main/java/ch/dlmw/swisssignchallenge/controllers/TokenController.java

@@ -0,0 +1,16 @@
+package ch.dlmw.swisssignchallenge.controllers;
+
+import org.openapitools.api.TokenApi;
+import org.openapitools.model.CreateSessionRequest;
+import org.openapitools.model.CreateSessionResponse;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class TokenController implements TokenApi {
+    @Override
+    public ResponseEntity<CreateSessionResponse> createToken(CreateSessionRequest createSessionRequest) {
+        var response = new CreateSessionResponse("blabla");
+        return ResponseEntity.ok(response);
+    }
+}