Add example for Mac OS X background running

etc/macosx-launchd/README.md

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+This directory contains an example for running Syncthing in the
+background under Mac OS X.
+
+ 1. Install the `syncthing` binary in a directory called `bin` in your
+    home directory.
+
+ 2. Edit the `syncthing.plist` file in the two places that refer to your
+    home directory; that is, replace `/Users/jb` with your actual home
+    directory location.
+
+ 3. Copy the `syncthing.plist` file to `~/Library/LaunchAgents`.
+
+ 4. Log out and in again, or run `launchctl load
+    ~/Library/LaunchAgents/syncthing.plist`.
+
+You probably want to turn off "Start Browser" among the settings to
+avoid it opening a browser window on each login.

etc/macosx-launchd/syncthing.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>Label</key>
+		<string>net.syncthing.syncthing</string>
+
+		<key>ProgramArguments</key>
+		<array>
+			<string>/Users/jb/bin/syncthing</string>
+		</array>
+
+		<key>EnvironmentVariables</key>
+		<dict>
+			<key>HOME</key>
+			<string>/Users/jb</string>
+			<key>STNORESTART</key>
+			<string>1</string>
+		</dict>
+
+		<key>KeepAlive</key>
+		<true/>
+
+		<key>LowPriorityIO</key>
+		<true/>
+
+		<key>ProcessType</key>
+		<string>Background</string>
+	</dict>
+</plist>