add bare-bones Flask deployment and instructions for running it

README.md

+# Welcome to Zesje
+
+Zesje is an online grading system for written exams.
+
+## Development
+
+### Setting up a development environment
+Make sure you have `npm`, `webpack` (installed via `npm`), and Python 3.5 installed.
+
+Install the necessary `npm` dependencies:
+
+    npm install
+
+We will keep the Python dependencies in a virtual environment:
+
+    virtualenv venv
+    source venv/bin/activate
+    pip install -r requirements.txt
+    
+### Running a development server
+First build all the client-side assets:
+
+    webpack --watch
+    
+the `--watch` flag tells webpack to rebuild the frontend code
+whenever files in `client/` change.
+
+Then, in a separate terminal, run the development server:
+ 
+    python server
+
+This will also re-load the code when you make modifications in `server/`.

server/__init__.py

+from flask import Flask
+
+app = Flask('zesje', static_folder='dist')
+
+@app.route('/')
+@app.route('/<file>')
+def index(file=None):
+    return app.send_static_file(file or 'index.html')

server/__main__.py

+from __init__ import app
+app.run(debug=True)