Add information on importing doccarchive into Xcode

Adds easy steps to automatically import doccarchive into Xcode

Author: stwrt

Makefile

@@ -8,3 +8,5 @@ preview:
 docc:
 	rm -rf docs/
 	xcodebuild docbuild -scheme WebKit -destination 'platform=macOS' -derivedDataPath ./docs
+	echo "WebKit.doccarchive generated at docs/Build/Products/Debug/"
+	open docs/Build/Products/Debug/WebKit.doccarchive

README.md

@@ -5,16 +5,30 @@ This repository contains the documentation for the WebKit Project.
 ## Build Documentation
 
 ### Preview Documentation Locally
+
+This will bring up a local web server, so you can view the documentation locally.
+
 ```
 make preview
 ```
 
 ### Docc Archive (Xcode)
+
+Generate a DocC Archive that will be automatically imported into Xcode's documentation.
+
 ```
 make docc
 ```
 
 ### GitHub Release
+
+Generate documentation for a release on GitHub Pages.
+
 ```
 make github
 ```
+
+## Import Documentation into Xcode
+
+Open the WebKit.doccarchive and it will be automatically imported into Xcode.
+Running `make docc` will also launch Xcode and import the document.