Add release notes for Elsa 3.6.0 (#7348)

* Initial plan

* Add release notes for Elsa 3.6.0

Co-authored-by: sfmskywalker <938393+sfmskywalker@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sfmskywalker <938393+sfmskywalker@users.noreply.github.com>
Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>

Author: Copilot