Documentation: Add note on difference between main and add-on contributions (#66)

Author: Chylum

content/docs/faq.mdx

@@ -50,3 +50,6 @@ You can create custom worlds using Unity. Check out the [World Creation Guide](/
 ### How can I contribute?
 
 We welcome contributions! See the [Contributing Guide](/docs/contributing) for more information on how to get involved.
+
+### What's the difference between core component contributions and add-on contributions?
+A: Core components include systems that make up the key features of Basis. Contributions (or modules) include extra features which, while useful, are not required by default. Therefore, contributions may provide features that are outside the scope of the main Basis offering, which may provide value to developers using Basis.