Add CosineSimilarity in readme (#17)

* Add CosineSimilarity in readme

* Fix link

Co-authored-by: auxten <[email protected]>

Author: Daniel-Robbins

README.md

@@ -30,7 +30,8 @@ GAUC on MovieLens 20M: **0.790542**
 
 Progress:
   - [x] [DIN test on MovieLens](./example/movielens/dinimpl_test.go)
-  - [x] [Euclidean Distance based attention](model/din/activation.go)
+  - [x] [Euclidean Distance based attention](model/activation.go)
+  - [x] [Cosine Similarity based attention](model/activation.go)
   - [x] Dropout and L2 regularization
   - [ ] Batch Normalization