Add notice of in-work

Author: mmcky

lectures/intro.md

@@ -11,6 +11,11 @@ kernelspec:
 
 # Computational Economics and Finance for Undergraduates
 
+```{admonition} Writing in progress
+:class: warning
+This lecture series is currently **in-work**
+```
+
 This website presents a set of lectures for undergraduates focusing on computational economics and finance, designed and written by [Thomas J. Sargent](http://www.tomsargent.com/) and [John Stachurski](http://johnstachurski.net/).
 
 For an overview of the series, see [this page](https://quantecon.org/python-lectures/)