Add frintd documentation

README.md

···
 ```bash
 paru -S \
   swayidle \
+  fprintd \
   yazi \
   btop \
   bluetui \
···
 ```bash
 ssh-keygen -t ed25519-sk -C [e-mail]
 ```
-
-#### Setup fingerprint reader
-
-I prefer to use the fingerprint reader to unlock my laptop and authorize `sudo` commands in my terminal.
 
 #### Setup Neovim
 
···
 
 #### Ensure systemd units are enabled
 
-By default CachyOS uses niri's auto-start feature for launching waybar and other tools. I prefer to let systemd do this by enabling them via:
+I use systemd to launch several services along niri. They must be enabled by:
 
 ```bash
 systemctl --user add-wants niri.service plasma-polkit-agent.service
···
 systemctl --user add-wants niri.service swayidle.service
 ```
 
+#### Setup fingerprint reader
+
+I prefer to use the fingerprint reader to unlock my laptop and authorize `sudo` commands in my terminal.
+
+Update PAM configuration to use fingerprint authentication.
+
+##### /etc/pam.d/sudo
+
+Add before other config:
+
+```
+auth      sufficient pam_fprintd.so
+```
+
+##### /etc/pam.d/polkit-1
+
+Add the following:
+
+```
+#%PAM-1.0
+auth      sufficient pam_fprintd.so
+auth      required   pam_unix.so
+account   required   pam_unix.so
+password  required   pam_unix.so
+session   required   pam_unix.so
+```
+
+##### /etc/pam.d/swaylock
+
+Add before other config:
+
+```
+auth      sufficient pam_unix.so try_first_pass likeauth nullok
+auth      sufficient pam_fprintd.so
+```
+
+##### Add new fingerprint
+
+Restart polkit agent:
+
+```bash
+systemctl --user restart plasma-polkit-agent.service
+```
+
+Enroll:
+
+```bash
+fprintd-enroll
+```
+
+Then verify:
+
+```bash
+fprintd-verify
+```
+
 #### Install development tools
 
 I use several tools for development that are not configured via my dotfiles, but need to be setup.
···
 paru -S opencode-bin
 ```
 
-##### Zen
+##### Brave
 
 My preferred browser:
 
 ```bash
-paru -S zen-browser-bin
+paru -S brave-bin
 ```
 
 ##### Obsidian