Added some documentation

docs/requirements.rst

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+.. _requirements:
+
+Requirements
+============
+
+You need a Linux machine or Unix-like setup (theoretically an Apple machine
+should work) that has the following software installed on it:
+
+* Python3 (with development libraries, pip and virtualenv)
+* Tesseract
+* Imagemagick
+
+If you're not working on a virtual environment (like Vagrant or Docker), you
+should probably be using a virtualenv, but that's your call.  The reasons why
+you might choose a virtualenv or not aren't really within the sope of this
+document.
+
+In addition to the above, there are a number of Python requirements, all of
+which are listed in ``requirements.txt``.  They will be installed automatically
+with ``pip`` as part of the installation process.
+
+
+.. _requirements-documentation:
+
+Documentation
+-------------
+
+As generation of the documentation is not required for use of *Paperless*,
+dependencies for this process are not included in ``requirements.txt``.  If
+you'd like to generate your own docs locally, you'll need to:
+
+.. code:: bash
+
+    $ pip install sphinx
+
+and then cd into the ``docs`` directory and type ``make html``.