Merge branch 'pr/66'

Add Product Design trail

trails/product-design.md

@@ -0,0 +1,24 @@
+Product Design
+=============
+
+Critical learning
+-----------------
+
+* Read [The Lean Startup](http://amzn.com/1568985819). ($)
+* Read thoughtbot's [The Playbook](http://playbook.thoughtbot.com/). (Free/$)
+* Read 37 Signal's [Getting Real](http://gettingreal.37signals.com/). ($)
+* Read 37 Signal's [Rework](http://37signals.com/rework) ($)
+* Watch Ryan Singer's [UX Sketching](https://peepcode.com/products/ryan-singer-ux) screencast. ($)
+* Watch Ryan Singer's [Prototyping](https://peepcode.com/products/ryan-singer-ii) screencast. ($)
+
+Validation
+----------
+
+You know basic product design when you can:
+
+* Define an MVP (Minimum Viable Product).
+* Explain the values of short product development cycles and iterative testing.
+* Write effective user stories.
+* Articulate your process in defining and solving interface problems.
+* Rapidly prototype.
+* Hold the Mayo: [Getting Real, chpt. 5](http://gettingreal.37signals.com/). ($)