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

[Ioi Lam]

On Wed, 27 Aug 2025 03:22:29 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> In Leyden EA 1, we used a special version of README.md as the release nodes:
> 
> https://jdk.java.net/leyden/ -> [Release Notes](https://github.com/openjdk/leyden/blob/leyden-ea1-release-notes/README.md)
> 
> As we are releasing Leyden EA 2, we will use the same process for the release notes.
> 
> - The README.md is taken from the [GIT version of Leyden EA 2 candidate](https://github.com/openjdk/leyden/commit/ffacb36e564b24e335b11fe5be8e574dffac2055) (as of today).
> - Removed information about building and benchmarks
> - Removed mentions of AOT features that have already been integrated into the mainline.
> - Updated the terminology from "CDS" to "AOT"
> 
> A rendered version of this document can be found here:
> - https://github.com/iklam/leyden/blob/leyden-ea2-release-notes/README.md
> 
> (I will merge some of the above changes back to leyden/premain branch after this PR is integrated).

This pull request has now been integrated.

Changeset: a5f8d2f9
Author:    Ioi Lam <iklam at openjdk.org>
URL:       https://git.openjdk.org/leyden/commit/a5f8d2f929e5807e061efbceef1f234728227087
Stats:     449 lines in 2 files changed: 23 ins; 377 del; 49 mod

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

Reviewed-by: kvn, heidinga

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PR: https://git.openjdk.org/leyden/pull/92