Update README.txt

Author: chsasank

beginner_source/former_torchies/README.txt

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+ PyTorch for former Torch users
+ ------------------------------
+ 
+1. tensor_tutorial.py
+	Tensors
+	http://pytorch.org/tutorials/beginner/former_torchies/tensor_tutorial.html
+
+2. autograd.py
+	Autograd
+	http://pytorch.org/tutorials/beginner/former_torchies/autograd_tutorial.html
+
+3. nn_tutorial.py
+	nn package
+	http://pytorch.org/tutorials/beginner/former_torchies/nn_tutorial.html
+
+4. parallelism_tutorial.py
+	Multi-GPU examples
+	http://pytorch.org/tutorials/beginner/former_torchies/parallelism_tutorial.html