Add Depricated warning

thoughtbot · Nov 18, 2019 · cdf3f38 · cdf3f38
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+# DEPRECATED
+
+This guide is no longer maintained and supported. We recommend reading through the [Sprint Book](https://www.thesprintbook.com/) instead.
+
+---
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 ![Design Sprint Phases](/images/phases.png?raw=true "Design Sprint Phases")
 
 # Product Design Sprint