added the cross origin stuff

backend/src/main/java/ovh/herisson/Clyde/EndPoints/LoginController.java

@@ -38,6 +38,7 @@ public class LoginController {
 
         HttpHeaders responseHeaders = new HttpHeaders();
         responseHeaders.set("Set-Cookie",String.format("session_token=%s",sessionToken));
+        responseHeaders.set("Access-Control-Allow-Credentials","true");
         return ResponseEntity.ok().headers(responseHeaders).build();
     }
 }