adapt README document

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

README.md

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+ego (the Go side)
+=================
+
+[![Go Reference](https://pkg.go.dev/badge/git.ophivana.moe/cat/ego.svg)](https://pkg.go.dev/git.ophivana.moe/cat/ego)
+
+> Do all your games need access to your documents, browser history, SSH private keys?
+>
+> ... No? Just run `ego steam`!
+
+**Ego** is a tool to run Linux desktop applications under a different local user. Currently
+integrates with Wayland, Xorg, PulseAudio and xdg-desktop-portal. You may think of it as `xhost`
+for Wayland and PulseAudio. This is done using filesystem ACLs and X11 host access control.
+
+Disclaimer: **DO NOT RUN UNTRUSTED PROGRAMS VIA EGO.** However, using ego is more secure than
+running applications directly under your primary user.
+
+Differences
+-----------
+* Written in Go
+* Tracks process states
+* Cleans up after last process exits
+* Argv preservation in machinectl mode
+* Has no dependencies other than the two C libraries
+
+Manual setup
+------------
+Ego aims to come with sane defaults and be easy to set up.
+
+**Requirements:**
+* Sudo
+* A C compiler
+* [Go](https://go.dev/doc/install)
+* `libacl.so` library (Debian/Ubuntu: libacl1-dev; Fedora: libacl-devel; Arch: acl)
+* `libxcb.so` library (Debian/Ubuntu: libxcb1-dev; Fedora: libxcb-devel; Arch: libxcb)
+
+**Recommended:** (Not needed when using `--sudo` mode, but some desktop functionality may not work).
+* `machinectl` command (Debian/Ubuntu/Fedora: systemd-container; Arch: systemd)
+* `xdg-desktop-portal-gtk` (Debian/Ubuntu/Fedora/Arch: xdg-desktop-portal-gtk)
+
+**Installation:**
+
+1. Run in repository worktree:
+
+       go build -v -ldflags '-s -w'
+       sudo cp ego /usr/local/bin/
+
+2. Create local user named "ego": <sup>[1]</sup>
+
+       sudo useradd ego --uid 155 --create-home
+
+3. That's all, try it:
+
+       ego xdg-open .
+
+[1] No extra groups are needed by the ego user.
+UID below 1000 hides this user on the login screen.
+
+### Avoid password prompt
+If using "machinectl" mode (default if available), you need the rather new systemd version >=247
+and polkit >=0.106 to do this securely.
+
+Create file `/etc/polkit-1/rules.d/50-ego-machinectl.rules`, polkit will automatically load it
+(replace `$USER` with your own username):
+
+```js
+polkit.addRule(function(action, subject) {
+    if (action.id == "org.freedesktop.machine1.host-shell" &&
+        action.lookup("user") == "ego" &&
+        subject.user == "$USER") {
+            return polkit.Result.YES;
+    }
+});
+```
+
+##### sudo mode
+For sudo, add the following to `/etc/sudoers` (replace `$USER` with your own username):
+
+    $USER ALL=(ego) NOPASSWD:ALL
+
+Appendix
+--------
+Ego is licensed under the MIT License (see the `LICENSE` file).
+The original Ego was created by Marti Raudsepp under the repository https://github.com/intgr/ego