Update 1.0 release notes

Author: ellmetha

docs/docs/the-marten-project/release-notes/1.0.md

@@ -27,6 +27,7 @@ _Under development._
 ### Development
 
 * The [`serve`](../../development/reference/management-commands.md#serve) management command now displays how long project compilation took after each successful build.
+* The [`new`](../../development/reference/management-commands.md#new) command now writes an `AGENTS.md` file when creating a project. The file describes the project layout, the generators, and how to run specs, so coding agents can work in the generated project.
 
 ## Backward incompatible changes