Resolve "docs: create changelog"

Closes #42 (closed)

CHANGELOG.md

+# lydra.yunohost Changelog
+
+## [1.0.0] - date to defined
+### Added
+- As we grew in terms of added features we have decided to transform this role into a collection.
+
+### Changed
+- This role is now divided into four roles: `ynh_setup`, `ynh_config`, `ynh_apps`, `ynh_backup`.
+
+## [0.2.0] - date to defined
+### Added
+- Adds the CHANGELOG.
+
+## [0.1.3] - 09-11-2021
+### Added
+- Two new tasks have been added. During Yunohost application setup you can now add additionnal scripts / configuration files which will be transferred to your Yunohost instance and run if necessary.
+
+### Changed
+- README explains how to use apps post-install feature.
+
+## [0.1.2] - 27-10-2021
+### Added
+- SMTP relay settings can now be changed. This is a new task.
+
+### Changed
+- README explains how to change SMTP relay values.
+
+## [0.1.1] - 21-10-2021
+### Fixed
+
+- fix default folder name into "defaults" to respect Ansible file architecture.
+
+## [0.1.0] - 21-10-2021
+### Added
+- The first release of the lydra.yunohost role. This role is a fork of two former Ansible roles : <https://github.com/TheRojam/ansible-yunohost> and <https://github.com/e-lie/ansible-yunohost>.
+- README is present in French and English as well as License info.