service: update readme.

README.md

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+# service (BETA)
+service will install / un-install, start / stop, and run a program as a service (daemon).
+Currently supports Windows XP+, Linux/(systemd | Upstart | SysV), and OSX/Launchd.
+
+Windows controls services by setting up callbacks that is non-trivial. This
+is very different then other systems. This package provides the same API
+despite the substantial differences.
+It also can be used to detect how a program is called, from an interactive
+terminal or from a service manager.
+
+## TODO
+Need to test the Interactive test for the following platforms:
+ * SysV
+ * systemd system and user service
+ * Launchd system and user service
+
+The following items need to be done:
+ * Determine if systemd has a launchd equivalent user service.
+ * Fix Interactive test for user services.
+ * Document that windows doesn't have a user service.
+ * Document that upstart's user service definition changes over versions. Do not support.
+ * For Linux platforms and Launchd add:
+   - UserName
+   - Arguments
+   - WorkingDirectory
+   - ChRoot
+ * Determine the best way to document the Config.Option values per platform.
+   - Should some of the current parameters like "ChRoot" and "WorkingDirectory" move to "Option" map?
+