TODO.md: move help dialog todo stuff here from README

Asahi Linux Helper/TODO.md

@@ -44,6 +44,10 @@
 - [ ] 2: Proper Help dialog
     - help icon in upper right corner of Preferences or something?
     - explain what the app does and why
+      - "this app uses Apple's official `bless` tool with --nextonly to temporarily make e.g. Linux load after restarting next time (i.e. without having to change the default Startup Disk value)"
+    - bonus: teach the possibility of using `sudo bless --mount` in Terminal.app and then restarting normally -> change OS for next time only
+    - bonus: teach newbies the essential skill of holding down the power button to get to boot picker (show animation?) 
+    - bonus: mention the Linux version of this tool (todo) and "Linux version of bless" (`sudo dnf install asahi-bless && sudo asahi-bless`)
     - link to Asahi web page (explain that we are not affiliated, at least not yet)?
 
 - [ ] 2: Quit confirmation dialog