docs: add directory structure

readme.md

@@ -3,11 +3,26 @@
 Dotfiles are user-specific configuration files that are typically stored as dotfiles, as in filenames that are prefixed
 with a dot or period (.). This project are my personal dotfiles and as such are available for reference and backup.
 
+- [Directory Structure](#directory-structure)
 - [Installation](#installation)
   - [Assumptions](#assumptions)
   - [Dependency Requirements](#dependency-requirements)
   - [Setup](#setup)
 
+## Directory Structure
+
+The directory structure listed below is in general terms and only those special
+files/directories are listed for explanation purposes.
+
+```console
+.
+├── bin/            < Executable
+├── system/         < System configuration
+├── user/           < User configuration
+├── LICENSE         < Project source code license
+└── README.md       < Project read me
+```
+
 ## Installation
 
 ### Assumptions