Update README.md

Author: mikeckennedy

README.md

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-# mongodb-quickstart-course
+# Mongodb quickstart course
+
+Placeholder for Talk Python's free MongoDB course. Will include demos and handout material for the course. 
+
+Please create an account or join the mailing list at [Talk Python Training](https://training.talkpython.fm/) to get notified when the course is available. We are aiming for the end of September / early October.
+
+-- Michael