First stab at choose your own adventure

backend/choose-your-own-adventure.md

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+# Choose your own adventure
+
+Welcome to your coding test; the final step!
+
+We know you've already spent plenty of your personal time during interviews. Worry not; this is the fun part.
+
+Below, we've presented you with some test options so you have the chance to _choose your own adventure_.
+
+<p align="center">
+  <img src="http://spinoff.comicbookresources.com/wp-content/uploads/2013/06/Choose-Your-Own-Adventure-Supercomputer-300x509.jpg">
+</p>
+
+
+We've hand-crafted three coding adventures in Scala within FoxCommerce's problem domain. Each adventure
+represents a different challenge from the next. Choose wisely!
+
+## Vending Machine
+
+Create a test-driven vending machine in Scala.
+The vending machine can take any currency you wish, and can sell any products you wish.
+The vending machine should be API driven and respond to basic commands, such as `pay` and `select_products`
+
+## Moderate Test
+
+Finish me!
+
+## Difficult Test
+
+Finish me!
+