Add CHANGELOG.md for 3.0.0-alpha1.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [3.0.0-alpha1] 2024-03-15
+
+This is the first official alpha release of the farmOS Crop Plan module.
+
+It is considered "alpha" because it is still very much a proof-of-concept, and
+is not going to be useful for most real-world crop planning. It can be used to
+visualize plantings on a timeline, but using it for day-to-day management is
+quite tedious. Moving forward, we hope to work as a community to identify and
+prioritize next steps based on what would be most useful.
+
+This project was originally started on farmOS v1 (see the `7.x-1.x` branch).
+We started a `2.x` branch as a placeholder during farmOS v2 development, but
+didn't have the resources to pick it back up again until farmOS v3. That is why
+this release is `3.0.0-alpha1` and there are no other releases before it. The
+full history is available in the Git commits if you are interested.
+
+Here is a summary of the major features this release provides:
+
+### Added
+
+- "Crop" plan type, with a "Season" reference field
+- "Crop planting" plan record type, with a "Plant" reference field, a "Seeding
+  date" field, and fields for "Days to maturity", "Days to transplant", and
+  "Days to harvest"
+- Form for adding Plant assets to the plan, along with plan-specific metadata.
+- Gantt chart visualization of Plant assets in the plan, using
+  [svelte-gantt](https://github.com/ANovokmet/svelte-gantt), with the ability to
+  view by plant type or by location.
+
+[Unreleased]: https://github.com/mstenta/farmOS/compare/3.0.0-alpha1...HEAD
+[3.0.0-alpha1]: https://github.com/mstenta/farmOS/releases/tag/3.0.0-alpha1