Add dataset card

README.md

@@ -65,7 +65,7 @@ val/iden_00003_img_4_sample_473_repeat_1/
 
 | Split   | Sample folders | Identities | Files | Size  |
 |---------|---------------:|-----------:|-------|------:|
-| `train` |         11,260 |        870 | 11,260 HQ PNG + 11,260 JSON | 19 GB |
+| `train` |         11,260 |        905 | 11,260 HQ PNG + 11,260 JSON | 19 GB |
 | `val`   |          1,329 |        100 | 1,329 HQ PNG + 1,329 LQ PNG + 1,329 JSON (+ 18 `old_*` leftover files) | 3.4 GB |
 
 *(The `train` and `val` identity sets are disjoint. `train` contains no LQ images — degradation for training is expected to be applied on the fly.)*