Add base GNU/Linux help file with file structure information

help/gnu_linux.md

@@ -0,0 +1,27 @@
+# The GNU/Linux System
+
+This file holds information about GNU/Linux in general.
+
+## Root file structure
+
+```
+/               # Root directory
+/bin            # Binaries for global commands (ls, cat, etc.)
+/boot           # Boot loader files (grub, the linux kernel, etc.)
+/dev            # "Device files" (/dev/null, /dev/random, etc.)
+/etc            # System-wide configuration files
+/home           # Saved files and personal settings of each user
+/lib            # Libraries used by the binaries in /bin
+/lib64          # 64-bit libraries
+/mnt            # Temporarily mounted filesystems reside here
+/opt            # Applications that don't rely on other dependencies
+/proc           # Provides process and kernel information as files
+/root           # Home directory for the root user
+/run            # Information about the running system since last boot
+/sbin           # System binaries (fsck, init, route, etc.)
+/srv            # Site-specific data served by the system
+/sys            # Contains information about the system
+/tmp            # Temporary files used for processes
+/usr            # Applications that rely on other dependencies
+/var            # Variable files that are supposed to change over time
+```