Update README.md

Add a table of contents near the top

README.md

@@ -5,6 +5,20 @@ My personal folder of reaction images that I use in conversation on Discord and
 > [!IMPORTANT]
 > All image and feature requests have been migrated from issues to [discussions](https://github.com/cheesits456/ReactionPics/discussions)
 
+<details><summary><strong><ins>Table of Contents:</ins></strong></summary>
+
+<!-- toc -->
+- [ReactionPics](#reactionpics)
+  - [About](#about)
+    - [Branch/Folder Structure](#branchfolder-structure)
+    - [Mitigation of Large File Sizes](#mitigation-of-large-file-sizes)
+  - [Usage](#usage)
+    - [How-to](#how-to)
+    - [Examples](#examples)
+<!-- tocstop -->
+
+</details>
+
 ## About
 
 ### Branch/Folder Structure