chore: checkpoint before Python removal

vendor/clap/examples/multicall-busybox.md

@@ -0,0 +1,39 @@
+See the documentation for [`Command::multicall`][crate::Command::multicall] for rationale.
+
+This example omits every command except true and false,
+which are the most trivial to implement,
+```console
+$ busybox true
+? 0
+
+$ busybox false
+? 1
+
+```
+*Note: without the links setup, we can't demonstrate the multicall behavior*
+
+But includes the `--install` option as an example of why it can be useful
+for the main program to take arguments that aren't applet subcommands.
+```console
+$ busybox --install
+? failed
+...
+
+```
+
+Though users must pass something:
+```console
+$ busybox
+? failed
+Usage: busybox [OPTIONS] [APPLET]
+
+APPLETS:
+  true   does nothing successfully
+  false  does nothing unsuccessfully
+  help   Print this message or the help of the given subcommand(s)
+
+Options:
+      --install <install>  Install hardlinks for all subcommands in path
+  -h, --help               Print help
+
+```