Adds Template for Specs (#12)

* Adds `docs` directory, along with boilerplate code and templates for readthedocs.org.

* docs: update orders spec

Co-authored-by: Lawrence Forman <me@merklejerk.com>

docs/index.rst

@@ -0,0 +1,68 @@
+0x Protocol
+===========
+
+.. image:: logo.svg
+    :width: 120px
+    :alt: 0x Protocol logo
+    :align: center
+
+
+Contents
+========
+
+:ref:`Keyword Index <genindex>`, :ref:`Search Page <search>`
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Basics
+
+   basics/orders.rst
+   basics/functions.rst
+   basics/events.rst
+   basics/allowances.rst
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Advanced
+
+   advanced/erc20_transformations.rst
+   advanced/aggregation.rst
+   advanced/weth_wrapping.rst
+   advanced/private_liquidity_pools.rst
+   advanced/request_for_quote.rst
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Architecture
+
+   architecture/overview.rst
+   architecture/proxy.rst
+   architecture/features.rst
+   architecture/flash_wallet.rst
+   architecture/transformers.rst
+
+.. toctree::
+   :maxdepth: 2
+   :caption: ZRX Tokenomics
+
+   tokenomics/protocol_fees.rst
+   tokenomics/staking.rst
+   tokenomics/governance.rst
+   tokenomics/voting.rst
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Additional Material
+
+   additional/audits.rst
+   additional/bounties.rst
+   additional/contributing.rst
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+