Readme for each episode

I'd like to create a markdown file for each episode with:

* Image representative of the episode
* Link to episode
* other metadata -- date, time, etc.
* Link to source code from episode
* Links to URLs mentioned in episode
* list of timecodes specifying segments of episode.

Then I'll copy/paste this into the YouTube description itself. Would love help with this!

Eventually we might want to make pages on https://thecodingtrain.com/ for these episodes and integrate into https://github.com/CodingTrain/website but for now maybe it's simplest to just create a file here for each one?

* [x] Episode 1
* [ ] Episode 2
* [ ] Episode 3

There's also an opportunity to take a quote from the episode for it's title!

Beginne damit, die vorhandene Markdown-Datei für Episode 1 zu prüfen und sie mit der Checkliste der verbleibenden Episoden zu vergleichen. Erstelle für jede Episode eine Markdown-Datei mit ihrem Bild, Links zur Episode und zum Quellcode, Metadaten, erwähnten URLs und Zeitcodes für die Segmente; überprüfe, dass die Dateien in die entsprechenden YouTube-Beschreibungen kopiert werden können.

Vom Indexierungsmodell aus dem Issue-Text verfasst.