Add simple placeholder README

README.md

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+## api-spec
+
+api-spec is a [Cucumber] extension for testing web APIs. It started from our own collection of Cucumber scenario's for BDDing [Nutshell's][nl] API updates. Based on a discussion in [balanced/balanced-api#431][b431], we decided to see what a gem might look like for packaging up this functionality. It's unclear if there's any value in a specific tool – it's simply just gluing together other gems – but we shall see.
+
+There's currently a fair amount of work, so please refer to the issues for any discussion around the gem's development.
+
+### Additional resources
+
+- [cucumber/aruba](https://github.com/cucumber/aruba)
+- [collectiveidea/json_spec](https://github.com/collectiveidea/json_spec)
+- [hoxworth/json-schema](https://github.com/hoxworth/json-schema/)
+
+[Cucumber]: https://github.com/cucumber/cucumber
+[nl]: http://www.nutshell.com/
+[b431]: https://github.com/balanced/balanced-api/pull/431#issuecomment-30152276