docs: add note about documentation in README (#6)

Reviewed-on: https://codeberg.org/vlw/scaffold/pulls/6
Co-authored-by: vlw <victor@vlw.se>
Co-committed-by: vlw <victor@vlw.se>

README.md

@@ -9,3 +9,9 @@ Run the install scripts for [Vegvisir](https://vegvisir.vlw.se/install) and/or [
 ```
 composer require vlw/scaffold
 ```
+
+Refer to the code comments in each file for documentation about its function. The base namespace is `vlw\Scaffold` and each class and function can be `use`d that way. For example:
+
+```php
+use vlw\Scaffold\Database\Model;
+```