Update README.md

Author: joneugster

README.md

@@ -4,15 +4,24 @@
 
 # Lean 4 Web
 
-This is a web version of Lean 4. The official lean playground is hosted at [live.lean-lang.org](https://live.lean-lang.org), while [lean.math.hhu.de](https://lean.math.hhu.de) hosts a development server testing newer features.
+This is a web version of Lean 4. There is a playground hosted at [live.lean-lang.org](https://live.lean-lang.org) and one at [lean.math.hhu.de](https://lean.math.hhu.de).
 
 In contrast to the [Lean 3 web editor](https://github.com/leanprover-community/lean-web-editor), in this web editor, the Lean server is
 running on a web server, and not in the browser.
 
+## Scope of lean4web
+
+The main scope of `lean4web` is to provide an easy way to run [MWEs](https://leanprover-community.github.io/mwe.html) from [Zulip](https://leanprover.zulipchat.com) with the latest [Mathlib](https://github.com/leanprover-community/mathlib4) installed.
+
+While `lean4web` looks very similar to VSCode with the [Lean4 extension](https://marketplace.visualstudio.com/items?itemName=leanprover.lean4) installed - and it reuses much of that code - there is currently no official support by the [Lean FRO](https://lean-fro.org) and therefore `lean4web` does not claim to be feature complete. 
+
 ## Contribution
 
 If you experience any problems, or have feature requests, please open an issue here!
-PRs are welcome as well.
+
+PRs fixing issues are very welcome!
+
+For new features, it's best to write an issue first to discuss them: For example, some functionality might be better implemented in [lean4monaco](https://github.com/hhu-adam/lean4monaco) which provides the key features and a discussion might be helpful to figure this out. 
 
 ## Documentation