[AltServer] Adds option to Launch at Login

Carthage/Checkouts/LaunchAtLogin/before-after.md

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+# Before and after
+
+With `LaunchAtLogin`, you only have to do 2 steps instead of 13!
+
+```diff
+-  1. Create a new target that will be the helper app that launches your app
+-  2. Set `LSBackgroundOnly` to true in the `Info.plist` file
+-  3. Set `Skip Install` to `YES` in the build settings for the helper app
+-  4. Enable sandboxing for the helper app
+-  5. Add a new `Copy Files` build phase to the main app
+-  6. Select `Wrapper` as destination
+-  7. Enter `Contents/Library/LoginItems` as subpath
+-  8. Add the helper build product to the build phase
+-  9. Copy-paste some boilerplate code into the helper app
+- 10. Remember to replace `bundleid.of.main.app` and `MainExectuableName` with your own values
+- 11. Copy-paste some code to register the helper app into your main app
+- 12. Make sure the main app and helper app use the same code signing certificate
+- 13. Manually verify that you did everything correctly
++  1. Install this package
++  2. Add a new "Run Script Phase"
+```