Update README

README.md

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+---
+license: mit
+tags:
+  - kornia
+  - feature-detection
+  - feature-description
+  - image-matching
+---
+
+# kornia/disk
+
+Pretrained weights for **DISK** (Learning local features with policy gradient),
+used by [`kornia.feature.DISK`](https://kornia.readthedocs.io/en/latest/feature.html).
+
+DISK is trained with policy gradient and produces dense heatmaps of keypoint
+probability and per-pixel 128-dim descriptors via a U-Net backbone. NeurIPS 2020.
+
+**Original repo:** [cvlab-epfl/disk](https://github.com/cvlab-epfl/disk)
+
+## Weights
+
+| File | Training supervision |
+|------|----------------------|
+| `depth-save.pth` | Depth |
+| `epipolar-save.pth` | Epipolar geometry |
+
+## Citation
+
+```bibtex
+@article{tyszkiewicz2020disk,
+    title   = {{DISK}: Learning local features with policy gradient},
+    author  = {Tyszkiewicz, Micha{\l} and Fua, Pascal and Trulls, Eduard},
+    journal = {Advances in Neural Information Processing Systems},
+    volume  = {33},
+    pages   = {14254--14265},
+    year    = {2020}
+}
+```