added cs50/r

Author: dmalan

.github/workflows/main.yml

@@ -31,6 +31,7 @@ jobs:
                 ['law', '2019/x'],
                 ['mobile', '2018/x'],
                 ['python', '2022/x'],
+                ['r', '2024/x'],
                 ['scratch', '2021/x'],
                 ['sql', '2023/x'],
                 ['sql', '2023/fall'],