Add developer notes to the language README files

scripts/new-lang-template/README.md

@@ -1,5 +1,20 @@
 # $LANG_NAME
 
-## References
+Add a short summary about the language, including link(s) to the language specification and sample programs.
+
+## Notes for the user
+
+- Add details and quirks (if any) about the Esolang Park implementation of this esolang.
+- These are details that the user may want to know while executing or debugging programs on the editor.
 
 ## Implementation details
+
+- Add notes that a contributor may want to read while looking at the source code of the language provider.
+- This includes any third-party libraries you've used, something you've done for performance, or just the
+  main decisions you took while implementing the language provider.
+- If the source code is simple enough, you can simply omit this section.
+
+## Possible improvements
+
+- Add any bugs or suboptimalities in the language provider that a contributor can work on.
+- (this section doesn't mean you can add a half-baked interpreter and leave, though.)