docs: update README with additional causal inference resources

Author: 김시은

README.md

@@ -46,10 +46,10 @@ class CollaborationFramework:
 | 6 | 10/12 | ✅ |  | 조해창 |  |
 | 7 | 10/19 | ✅ |  |  |  |
 | 8 | 10/26 |  | — | — | — |
-| 9 | 11/2 | ✅ |  |  |  |
+| 9 | 11/2 | ✅ |  | 김시은|  |
 | 10 | 11/9 | ✅ | 권명석, 강산아 (학회) |  |  |
 | 11 | 11/16 |  | — | — | — |
-| 12 | 11/23 | ✅ |  | 조해창 |  |
+| 12 | 11/23 | ✅ |  | 조해창 | 김시은 |
 | 13 | 11/30 | ✅ |  |  |  |
 | 14 | 12/7 | ✅ |  |  |  |
 | 15 | 12/14 | ✅ |  |  |  |