Add file structure to index.rst.

docs/index.rst

@@ -3,6 +3,7 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
+===============================
 Welcome to VDL's documentation!
 ===============================
 
@@ -16,6 +17,34 @@ This documentation documents how to reproduce the result in the VDL project.
 
 The final presentation is hosted `here <https://docs.google.com/presentation/d/1r4zVv6bnImt8xTVtxopYhg1lWAeXrgliMfQQTo5Nlng/edit?usp=sharing>`__
 
+Files in this project
+=====================
+
+.. code-block:: bash
+
+    # Main
+    docs/                   # Documentation files in reStructuredText format
+    universe-starter-agent/ # Virtual distributed learning system, the code is
+    # modified from https://github.com/openai/universe-starter-agent, which
+    # provides the baseline learning algorithm.
+
+    # Components
+    learner-actor/          # Experiment code for learner-actor communication
+    tensorflow_MNIST/       # Experiment code for P2P-multi-learner
+
+    # Utility
+    gym-demo/               # Virtual environnment demos to make sure the dev
+    # boxs are correctly configured.
+    benchmark/              # Benchmark code to evaluate the network speed and
+    # speed of different virtual environments
+    neonrace/               # Code to run trained neonrace auto-driving model
+    spread/                 # Compiled spread and its python wrapper
+
+    # Virtual arm
+    arm-pose/               # Pose estimation code trained on the virtual arm
+    # and test on the real arm.
+    owi-arm/                # Code to control real and the virtual arm
+
 .. toctree::
    :maxdepth: 2
    :caption: Contents: