docs: update package retrival docs in README

These commands and flag descriptions are more for my own usage in the
future rather than any comprehensive or full documentation.

README.md

@@ -3,4 +3,11 @@
 2) Add `monitors.conf` in `~/.config/hypr/` for your specific monitor setup
 
 # Packages
-- Used `pacman -Qqen > packages.txt` to get all explicit packages
+- Used `sudo pacman -Qqen` to get all explicit offical packages
+- Used `sudo pacman -Qqem` to get all explicit unofficial AUR packages
+## Meaning
+- `-Q`: Query local package database
+- `-q`: Quiet flag, print only package name
+- `-e`: Only show **explicitly** installed packages
+- `-n`: Native packages only
+- `-m`: Foreign packages only