git: openjdk/leyden: leyden-ea2-release-notes: Update README.md to be used as Release Notes for Leyden EA 2

[Ioi Lam]

Changeset: a5f8d2f9
Branch: leyden-ea2-release-notes
Author:    Ioi Lam <iklam at openjdk.org>
Date:      2025-08-27 22:07:39 +0000
URL:       https://git.openjdk.org/leyden/commit/a5f8d2f929e5807e061efbceef1f234728227087

Update README.md to be used as Release Notes for Leyden EA 2

Reviewed-by: kvn, heidinga

+ 00-ABOUT-THIS-BRANCH
! README.md