Initial farmOS 2.x CHANGELOG.md.

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).
+
+## [2.0.0-beta1] 2022-01-01
+
+farmOS 2.x is a complete rewrite of farmOS for [Drupal 9](https://www.drupal.org/about/9).
+This brings many improvements, modernizations, and new features. The following
+is a brief summary of notable changes from the 1.x branch of farmOS (aka 7.x-1.x
+for Drupal 7).
+
+Detailed release notes will be included in this file with each new release
+moving forward.
+
+### Notable changes from farmOS 1.x
+
+- Data model
+  - [Documented data model](https://farmOS.org/model)
+  - [Areas are now types of Assets](https://farmos.org/development/api/changes/#areas)
+  - New Asset types: Land, Structure, Water, Material, Seed
+  - Planting Assets are renamed to Plant
+  - New Log types: Lab test (merged Soil and Water tests)
+  - [Inventory tracking](https://farmos.org/model/logic/inventory/) for all
+    Asset types
+  - Improved [Asset location](https://farmos.org/model/logic/location/) logic,
+    including the ability to designate Assets as "fixed" (with intrinsic
+    geometry) and/or "locations" (allowing other Assets to be moved to them)
+  - Improved [Group membership](https://farmos.org/model/logic/group/) logic,
+    including member inheritence of group location
+  - Support for [Quantity types](https://farmos.org/model/type/quantity/#type)
+  - Revisions for tracking changes to records
+  - Improved "Data streams" framework for sensors and other time-series data
+    collection
+  - ID tags on all Asset types
+  - Flags can be limited by record type
+- User interface/experience (UI/UX)
+  - Improved location hierarchy drag-and-drop editor, including ability to edit
+    sub-hierarchies
+  - Improved KML/KMZ importer for bulk Land Asset creation
+  - Geocoding of GeoJSON and GPX files (in addition to KML/KMZ) on individual
+    Assets and Logs
+  - Farm settings UI with simplified module installer
+  - [Gin](https://www.lullabot.com/podcasts/lullabot-podcast/gin-admin-theme-drupals-future-ui)
+    admin theme
+  - Improved mobile support
+- APIs, libraries, and developer experience (DX)
+  - [Documented API changes](https://farmos.org/development/api/changes/)
+  - Modernized RESTful API built on [JSON:API](https://jsonapi.org/)
+  - [JSON Schema](https://json-schema.org/) for all API resources
+  - 2.x API support in [farmOS.js](https://github.com/farmOS/farmOS.js) and
+    [farmOS.py](https://github.com/farmOS/farmOS.py) libraries
+  - Updated [farmOS-map](https://github.com/farmOS/farmOS-map) library based on
+    [OpenLayers](https://openlayers.org/)
+  - Improved APIs for [module builders](https://farmos.org/development/module/)
+  - Object-oriented architecture based on [Symfony](https://symfony.com/)
+  - Dependency management via [Composer](https://getcomposer.org/)
+  - Automated testing via [PHPUnit](https://phpunit.de/) and
+    [GitHub Actions](https://github.com/farmOS/farmOS/actions)
+  - Coding standards enforcement via [CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer)
+  - Feature branch previews via [Tugboat](https://www.tugboat.qa/)
+- Hosting
+  - PostgreSQL database support (alongside MySQL, MariaDB, and SQLite3)
+  - [Automated migration](https://farmos.org/hosting/migration/) from 1.x to 2.x
+  - Improved performance with lazy-loading code and caching options
+  - Improved support for translation/localization (l10n)
+- Security
+  - Support from the [Drupal Security Team](https://www.drupal.org/drupal-security-team)
+  - Drupal 9 will be supported (with security updates) until November 2023.
+  - Drupal 10 will be released mid-2022. farmOS will be prepared to update as
+    soon as possible. This process will be trivial compared to the upgrade from
+    Drupal 7, which required a complete refactor of the codebase. By comparison,
+    updating from Drupal 9 to 10 will simply involve updating deprecated code.
+
+[2.0.0-beta1]: https://github.com/farmOS/farmOS/releases/tag/2.0.0-beta1