feat(wpcarro/emacs): Support passage.el

Intentionally-feature-incomplete Elisp integration with `passage`.

Change-Id: Ia46ddb93ac7df1f91b9d9221ac8fbe5f11010f97
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7559
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>

users/wpcarro/emacs/pkgs/passage/README.md

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+# passage.el
+
+Emacs support for `passage`.
+
+## Alternative Packages
+
+If you're looking for more feature-complete, configurable alternatives,
+check-out the following packages:
+
+- `ivy-pass.el`
+- `password-store.el`
+- `pass.el`