Basic introduction

12-healthkit/12-healthkit.md

@@ -9,4 +9,22 @@ but have a read through the rest of this post first!
 
 ## Introduction
 
+One of the more consumer-oriented features introduced in iOS8 is that of the
+Health app. It was featured in the keynote at WWDC and was... THIS ISN'T
+FINISHED.
+
+The underlying technology behind the health app is HealthKit, which is
+essentially a structured datastore designed specifically for health data. Not
+only is there an schema for health data, but extra concerns such as access
+permissions, querying and unit conversion. HealthKit allows app developers to
+interact with this datastore - to add and query data points and calculate
+statistics.
+
+In today's article you'll get a whistle-stop tour of some of the features of
+HealthKit, and see how easy it is to create an app which can save data points
+and query the datastore. The accompanying app is called __BodyTemple__ and is
+available in the github repo at
+[github.com/ShinobiControls/iOS8-day-by-day](https://github.com/ShinobiControls/iOS8-day-by-day).
+
+
 ## Conclusion