Documentation: Add 24.05 release notes template

In preparation for the upcoming release, add the template for the
24.05 release and update index.md.

Change-Id: Ic8fdf82519ffa4001bcc06bdd808eaebdde18a1e
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80618
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

Documentation/releases/coreboot-24.05-relnotes.md

@@ -0,0 +1,95 @@
+Upcoming release - coreboot 24.05
+========================================================================
+
+The 24.05 release is scheduled for Mid May, 2024
+
+
+Update this document with changes that should be in the release notes.
+
+* Please use Markdown.
+* See the past few release notes for the general format.
+* The chip and board additions and removals will be updated right
+  before the release, so those do not need to be added.
+* Note that all changes before the release are done are marked upcoming.
+  A final version of the notes are done after the release.
+
+
+
+Significant or interesting changes
+----------------------------------
+
+* Add changes that need a full description here
+
+* This section should have full descriptions and can or should have
+  a link to the referenced commits.
+
+
+
+Additional coreboot changes
+---------------------------
+
+The following are changes across a number of patches, or changes worth
+noting, but not needing a full description.
+
+* Changes that only need a line or two of description go here.
+
+
+
+Changes to external resources
+-----------------------------
+
+### Toolchain updates
+
+
+### Git submodule pointers
+
+
+### External payloads
+
+
+
+Platform Updates
+----------------
+
+### Added mainboards:
+* To be filled in immediately before the release by the release team
+
+
+### Removed Mainboards
+* To be filled in immediately before the release by the release team
+
+
+### Updated SoCs
+* To be filled in immediately before the release by the release team
+
+
+
+Plans to move platform support to a branch
+------------------------------------------
+* To be filled in immediately before the release by the release team
+
+
+
+Statistics from the 4.22 to the 24.02 release
+--------------------------------------------
+* To be filled in immediately before the release by the release team
+
+
+
+Significant Known and Open Issues
+---------------------------------
+
+Issues from the coreboot bugtracker: https://ticket.coreboot.org/
+* To be filled in immediately before the release by the release team
+
+
+
+coreboot Links and Contact Information
+--------------------------------------
+
+* Main Web site: https://www.coreboot.org
+* Downloads: https://coreboot.org/downloads.html
+* Source control: https://review.coreboot.org
+* Documentation: https://doc.coreboot.org
+* Issue tracker: https://ticket.coreboot.org/projects/coreboot
+* Donations: https://coreboot.org/donate.html