add pic to readme

Author: soumith

README.md

@@ -50,6 +50,8 @@ Elaborating further:
 
 If you use numpy, then you have used Tensors (a.k.a ndarray).
 
+<p align=center><img width="30%" src="docs/source/_static/img/tensor_illustration.png" /></p>
+
 PyTorch provides Tensors that can live either on the CPU or the GPU, and accelerate
 compute by a huge amount.
 
@@ -75,6 +77,8 @@ from several research papers on this topic, as well as current and past work suc
 While this technique is not unique to PyTorch, it's one of the fastest implementations of it to date.
 You get the best of speed and flexibility for your crazy research.
 
+<p align=center><img width="80%" src="docs/source/_static/img/dynamic_graph.gif" /></p>
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 ### Python first
 
 PyTorch is not a Python binding into a monolothic C++ framework.