docs: update

Author: dylanaraps

README.md

@@ -6,6 +6,17 @@ Change terminal colors on the fly.
 
 A list of hex colors are supplied via command-line arguments, `stdin` or a file and `pal` sends these colors to all open terminals, modifying their palette. The purpose of this tool is to allow theme managers and individual scripts to effortlessly modify the current color-scheme without needing a reload of running terminals.
 
+## Table of Contents
+
+<!-- vim-markdown-toc GFM -->
+
+* [Dependencies](#dependencies)
+* [Installation](#installation)
+* [Usage](#usage)
+    * [Applying colors to newly opened terminals.](#applying-colors-to-newly-opened-terminals)
+
+<!-- vim-markdown-toc -->
+
 ## Dependencies
 
 - `bash`