Update README

README.md

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+---
+license: mit
+tags:
+  - kornia
+  - feature-description
+  - patch-descriptor
+---
+
+# kornia/sosnet
+
+Pretrained weights for **SOSNet**,
+used by [`kornia.feature.SOSNet`](https://kornia.readthedocs.io/en/latest/feature.html).
+
+SOSNet is a 128-dimensional patch descriptor that adds a second-order similarity
+regularisation term to the HardNet loss, enforcing that the structure of the descriptor
+space reflects patch similarity at multiple scales. CVPR 2019.
+
+**Original repo:** [yuruntian/SOSNet](https://github.com/yuruntian/SOSNet)
+
+## Weights
+
+| File | Training data |
+|------|--------------|
+| `sosnet_32x32_liberty.pth` | Liberty |
+| `sosnet_32x32_hpatches_a.pth` | HPatches-A |
+
+## Citation
+
+```bibtex
+@InProceedings{sosnet2019,
+    author    = {Tian, Yurong and Yu, Xin and Fan, Bin and Wu, Fuchao
+                 and Heijnen, Huub and Balntas, Vassileios},
+    title     = {{SOSNet}: Second Order Similarity Regularization for
+                 Local Descriptor Learning},
+    booktitle = {CVPR},
+    year      = {2019}
+}
+```