Added first steps of installation documentation

doc/admin/config.rst

@@ -1,5 +1,7 @@
 .. highlight:: ini
 
+.. _`config`:
+
 Configuration file
 ==================
 

doc/admin/index.rst

@@ -8,4 +8,5 @@ Contents:
 .. toctree::
    :maxdepth: 2
 
+   installation
    config

doc/admin/installation.rst

@@ -0,0 +1,36 @@
+.. highlight:: ini
+
+Installation
+============
+
+Requirements
+------------
+To use pretix, the most minimal setup consists of:
+
+* **pretix** and the python packages it depends on
+* An **WSGI application server** (we recommend gunicorn)
+
+You get those two bundled in the ``pretix/standalone`` docker image.
+
+If you want to set them up manually, you can also get pretix from GitHub or wait for us to set up proper
+``pip`` packages and set up a simple gunicorn instance pointing to the ``pretix.wsgi`` endpoint.
+
+To run pretix, you will need at least Python 3.2, although we recommend **Python 3.4** as we will
+remove support for 3.2 soon and some features (like PDF output) already do not work with 3.2.
+
+You can get the direct dependencies by doing a ``pip install -r requirements.txt`` in the pretix source
+directory. You'll also need ``nodejs`` and the ``less`` node package. We'll provide detailled documentation
+on this as soon as pretix will be officially released.
+
+If you have real users on your system you'll **really** want to use
+
+* A database (MySQL or PostgreSQL)
+* A reverse proxy web server (nginx or Apache)
+
+Optionally, you can speed up pretix by adding
+
+* A memcached instance
+* A redis database
+
+We will provide a step-by-step tutorial with the first stable release, but all configuration
+already :ref:`is documented <config>`.