add changelog and update Readme [CI SKIP]

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]
+
+### Added
+- added Changelog
+
+### Changed
+- License changed to MIT
+
+## [0.1.2] - 2014-08-09
+
+### Fixed
+- fixed wrong javascript file linked in link add page
+
+## [0.1.1] - 2014-07-10
+
+### Changed
+- Consolidated frontend javascript functions into one file
+
+## [0.1.0] - 2023-05-05
+
+### Added
+- User Creation on first start via API
+- Admin Login for /admin/
+- Ability to add and delete short links
+
+
+[unreleased]: https://codeberg.org/lauralani/go-urlsh/compare/0.1.2...HEAD
+[0.1.2]: https://codeberg.org/lauralani/go-urlsh/compare/0.1.1...0.1.2
+[0.1.1]: https://codeberg.org/lauralani/go-urlsh/compare/0.1.0...0.1.1
+[0.1.0]: https://codeberg.org/lauralani/go-urlsh/releases/tag/0.1.0

README.md

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 # go-urlsh
+![status-badge](https://ci.codeberg.org/api/badges/12206/status.svg)
 [![Please don't upload to GitHub](https://nogithub.codeberg.page/badge.svg)](https://nogithub.codeberg.page)
 
 
-URL Shortener in Go
+URL Shortener in Go
+
+## Changelog
+You can find the Changelog here: [Changelog](https://codeberg.org/lauralani/go-urlsh/src/branch/main/CHANGELOG.md)
+
+## License
+`go-urlsh` is available under the MIT license. See the LICENSE file for more info.