docs: document running Registry natively on OS X

Signed-off-by: Kelsey Hightower <kelsey.hightower@gmail.com>

docs/osx-setup-guide.md

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+# OS X Setup Guide
+
+This guide will walk you through running the new Go based [Docker registry](https://github.com/docker/distribution) on your local OS X machine.
+
+## Checkout the Docker Distribution source tree
+
+```
+mkdir -p $GOPATH/src/github.com/docker
+git clone https://github.com/docker/distribution.git $GOPATH/src/github.com/docker/distribution
+cd $GOPATH/src/github.com/docker/distribution
+```
+
+## Build the registry binary
+
+```
+GOPATH=$(PWD)/Godeps/_workspace:$GOPATH make binaries
+sudo cp bin/registry /usr/local/libexec/registry
+```
+
+## Setup
+
+Copy the registry configuration file in place:
+
+```
+mkdir /Users/Shared/Registry
+cp docs/osx/config.yml /Users/Shared/Registry/config.yml
+```
+
+## Running the Docker Registry under launchd
+
+Copy the Docker registry plist into place:
+
+```
+plutil -lint docs/osx/com.docker.registry.plist
+cp docs/osx/com.docker.registry.plist ~/Library/LaunchAgents/
+chmod 644 ~/Library/LaunchAgents/com.docker.registry.plist
+```
+
+Start the Docker registry:
+
+```
+launchctl load ~/Library/LaunchAgents/com.docker.registry.plist
+```
+
+### Restarting the docker registry service
+
+```
+launchctl stop com.docker.registry
+launchctl start com.docker.registry
+```
+
+### Unloading the docker registry service
+
+```
+launchctl unload ~/Library/LaunchAgents/com.docker.registry.plist
+```