Adding references folder

Contains supplementary material

Author: Agrover112

references/README.md

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+## References
+- SELU : [Self Normailizing Neural Networks](https://arxiv.org/abs/1706.02515)
+- GELU : [Gaussian Error Linear Units (GELUs)- Elu ](https://arxiv.org/abs/1606.08415)
+- PRELU : [Delving Deep into Rectifiers: Surpassing Human-Level Performance on ImageNet Classification](https://arxiv.org/abs/1502.01852)
+- Leaky ReLU : [Rectifier Nonlinearities Improve Neural Network Acoustic Models](http://robotics.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf)
+    
+- [Activation Functions Blog](https://mlfromscratch.com/activation-functions-explained/#elu)