Add a note about capitalizing component names

Author: amirhhashemi

src/routes/concepts/components/basics.mdx

@@ -27,6 +27,13 @@ function App() {
 }
 ```
 
+:::info[Note]
+
+Component names must start with a capital letter to distinguish them from regular HTML elements.
+Otherwise, they won't be recognized as components.
+
+:::
+
 ## Component trees
 
 A web page is displayed by rendering a component tree, which is a hierarchical structure of components.