Elaborate README.md

Author: goldsborough

README.md

@@ -1,3 +1,16 @@
 # pytorch-cpp-extension
 
-An example of writing a C++ extension for PyTorch.
+An example of writing a C++ extension for PyTorch. See
+[here](http://pytorch.org/docs/0.3.1/notes/cpp-extensions.html) for the accompanying tutorial.
+
+There are a few "sights" you can metaphorically visit in this repository:
+
+- Inspect the C++ and CUDA extensions in the `cpp/` and `cuda/` folders,
+- Build C++ and/or CUDA extensions by going into the `cpp/` or `cuda/` folder and executing `python setup.py install`,
+- JIT-compile C++ and/or CUDA extensions by going into the `cpp/` or `cuda/` folder and calling `python jit.py`, which will JIT-compile the extension and load it,
+- Benchmark Python vs. C++ vs. CUDA by running `python benchmark.py {py, cpp, cuda} [--cuda]`,
+- Run gradient-checks on the code by running `python grad_check.py {py, cpp, cuda}`.
+
+## Authors
+
+[Peter Goldsborough](https://github.com/goldsborough)