Update the doc and add line to config.yml.

Author: cwant

README.md

@@ -1,3 +1,18 @@
-This creates as CSV file to export to TeSS software, using the
+This creates a CSV file to export to TeSS software, using the
 [youtube_to_csv](https://github.com/ualberta-rcg/youtube_to_csv) python code
-and a Github action (I hope).
+and a Github action.
+
+The ingredients:
+
+* The `config.yml` has the configuration for generating the CSV file. Specifically:
+  * it has a URL to a Youtube RSS feed for our channel.
+  * it has some some default metadata values for each videos
+  * it also has some specific metadata values for each video (identified by title)
+* It has an action that then generates and commits the `youtube.csv` file on each commit.
+  This action is `.github/workflows/generate_csv.yml`. The software that generates the CSV
+  file is [youtube_to_csv](https://github.com/ualberta-rcg/youtube_to_csv), which the action
+  checks out of Github and runs when a commit is pushed to `main` branch
+
+The output: `youtube.csv`, which can be pointed at through a `Material CSV` source in TeSS.
+
+TODO: maybe make the action smart enough that it only runs on changes to `config.yml`.

config.yml

@@ -1,4 +1,5 @@
 url: https://www.youtube.com/feeds/videos.xml?channel_id=UCERhES8Kh7n29qtkoEl9MSQ
+
 defaults:
   licence: CC-BY-NC-SA-4.0
   status: active