Update README

Author: jamieburchell

readme.rst

@@ -1,3 +1,16 @@
+## ⚠️ Disclaimer
+
+This is a **personal fork of CodeIgniter 3**, maintained **only for my own use and for the company I work for**.  
+It exists to **update CodeIgniter 3 for newer PHP versions** used in our projects.
+
+> 🛠️ This fork is **not intended for public use**.  
+> ❌ I don’t provide support, accept issues, or review pull requests.  
+> ⏳ Compatibility with older PHP versions is **not guaranteed**.  
+> 🔄 **Version requirements and compatibility may change at any time without notice.**  
+> 🔍 If you’re looking for a maintained public fork, there are **other community versions** available on GitHub.
+
+Use this repository **at your own risk**.
+
 ###################
 What is CodeIgniter
 ###################