Add some lines to readme

README.md

@@ -8,9 +8,16 @@ New new Thalia website, now with extra Django.
 Getting started
 ---------------
 
+0. Get at least Python 3.4
 1. Clone this repository
 2. Run `source ./source_me.sh` (or use your own favourite virtualenv solution)
 3. Run `pip install -r requirements.txt`
 4. Run `pip install -r dev-requirements.txt`
 5. `cd website`
 6. `./manage.py migrate` to initialise the database
+7. `./manage.py runserver` to run a testing server
+
+Testing and linting
+-------------------
+
+1. In the root folder of the project, run `tox`.