chore: add introduction to RELEASES.md (#2476)

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Unreleased
# Lean 4 releases
We intend to provide regular "minor version" releases of the Lean language at approximately monthly intervals.
There is not yet a strong guarantee of backwards compatibility between versions,
only an expectation that breaking changes will be documented in this file.
This file contains work-in-progress notes for the upcoming release, as well as previous stable releases.
Please check the [releases](https://github.com/leanprover/lean4/releases) page for the current status of each version.
v4.0.0
---------
* [`dsimp` / `simp` / `simp_all` now fail by default if they make no progress](https://github.com/leanprover/lean4/pull/2336).