Add reference to Swift API design guidelines.

jeremywiebe · jeremywiebe · commit ba5bbafdc3f8 · 2016-02-01T10:05:25.000-08:00
diff --git a/swift/README.md b/swift/README.md
@@ -1,3 +1,7 @@
+The Mobify style guide for Swift is largely embodied in the [Astro](mobify/astro) Swift code. Think of that codebase as "canonical" Swift code.
+
+We also follow the [Swift API design guidelines](https://swift.org/documentation/api-design-guidelines/) in all of the code we write.
+
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 +The Mobify style guide for Swift is largely embodied in the [Astro](mobify/astro) Swift code. Think of that codebase as "canonical" Swift code.
++
 +We also follow the [Swift API design guidelines](https://swift.org/documentation/api-design-guidelines/) in all of the code we write.
++
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 =======