add intro to OOP classes article

Author: Fernando-A-Rocha

web/src/pages/OOP_Classes.astro

@@ -11,7 +11,7 @@ const classesByCategory = getOOPClassesByCategory();
     tableOfContents: false,
 }}>
     <p>This page lists all <strong><a href="/OOP">OOP</a> Classes</strong> available in the <a href="/Lua_API">Lua API</a> organized by category.</p>
-
+    <p>Vectors and Matrices make it easier to drop the complex maths and go straight ahead with fun part of maths. OOP does not have to be enabled in the server config for this to be enabled.</p>
 
     {Object.entries(classesByCategory).map(([category, oopClasses]) => (
         <section>