Add course image to the repo.

Author: mikeckennedy

README.md

@@ -2,6 +2,8 @@
 
 Demo code and other handouts for students of our FastAPI Web Apps course.
 
+[![](./data/readme_resources/fastapi-apps.png)](https://training.talkpython.fm/getnotified)
+
 Course coming early 2021. [Get notified](https://training.talkpython.fm/getnotified).
 
 See the [course revisions and change log](./revisions.md).