added changelog, updated project version

Author: ThatAmuzak

CHANGELOG.md

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+
+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [3.0.0] - 2025-02-20
+
+Full conversion of project to UPM Package
+
+### Added
+
+- Change log
+- Included support for Unity 6 with backward compatibility
+
+## Changed
+
+- Project structure for UPM package setup with instructions on installation
+
+## Fixed
+
+- Unused Imports
+
+## [2.0.1] - 2024-07-07
+
+### Fixed
+
+- Instance caused a stack overflow
+
+## [2.0.0] - 2024-01-23
+
+Major revision of the singletons implementation
+
+### Added
+
+- Added `PersistentMonoSingleton` which is persistent across scenes
+- Added `ISingleton` interface for unifying the methods and calls
+- Added assembly definition
+- Added namespace (`UnityCommunity.UnitySingleton`)
+
+### Changed
+
+- Made `MonoSingleton` non-persistent
+
+## [1.2.1] - 2024-01-22
+
+### Fixed
+
+- Added missing methods for `MonoSingleton`
+
+## [1.2.0] - 2017-12-2
+
+### Added
+
+- Init for existing instance and basic editor mode support
+
+## [1.1.0] - 2023-11-27
+
+### Added
+
+- Scene `Singleton` (or Local Singleton) for non-persistent singletons across scene changes
+- `MonoSingleton` to quickly extend `MonoBehaviour` as singletons
+
+### Changed
+
+- Extended Generic `Singleton` class with additional virtual functions (earlier this was extending `MonoBehaviour`)
+
+## [1.0.0] - 2017-09-16
+
+### Added
+
+- Base files for the project with a generic `Singleton`

CHANGELOG.md.meta

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 {
  "name": "com.unitycommunity.unitysingleton",
- "version": "2.0.0",
+ "version": "3.0.0",
  "displayName": "Unity Singleton",
  "description": "The best way to implement singleton pattern in Unity. ",
  "unity": "2022.3",