Update README, add requirements, add env

README.md

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+# Die ZEIT Downloader
+
+This is a simple downloader for the digital formats of the weekly newspaper [Die Zeit](https://www.zeit.de). A digital subscription is required.
+It is written in only 70 lines of python
+
+[![asciicast](https://asciinema.org/a/2Eg8PPKI47iFGxRYFP8Kigqz3.svg)](https://asciinema.org/a/2Eg8PPKI47iFGxRYFP8Kigqz3)
+
+## Installation
+
+1. Clone this repo or download the `zeitdownload.py`.
+2. Make sure the requirements are installed:
+    * `sudo pip3 install -r requirements.txt`
+3. Run with `./zeitdownload.py`.
+
+## Documentation
+
+```
+usage: zeitdownload.py [-h] --email EMAIL --password PASSWORD [--pdf] [--epub]
+                       [--mobi]
+
+Download "Die Zeit" in multiple formats from the premium subscription service
+
+optional arguments:
+  -h, --help           show this help message and exit
+  --email EMAIL        Email you used for the digital subscription signup
+  --password PASSWORD  Corresponding password
+  --pdf                Download full-page PDF
+  --epub               Download EPUB file for E-Readers
+  --mobi               Download MOBI file for Kindles
+```

requirements.txt

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+requests
+lxml

zeitdownload.py

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+#!/usr/bin/env python3
 import requests
 import lxml.html
 import cgi