Adding a CHANGELOG.md for Unreleased and released changes (tags)

Signed-off-by: Raphaël Tournoy <[email protected]>

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](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- 
+## Unreleased
+### Fixed
+### Added
+### Changed
+### Deprecated
+### Removed
+### Security
+-->
+
+## 1.0.12 - 2021-07-15
+
+### Added
+- OAI-PMH endpoint: cache metadata to improve response time
+- new translations + fixed typo
+
+#### Rating status
+- New "obsolete rating" status for reviews no longer needed. The reviewing on an obsolete version is no longer possible (when a new version has been requested).
+- It's not possible to invite reviewers on an obsolete version  
+- New flash message when a user tries to review an article under revision (a new version has been requested to the authors)
+
+
+
+### Changed
+- Users list: invalid accounts are no longer listed
+
+### Fixed
+- [38](https://github.com/CCSDForge/episciences/issues/38): article versions may be listed in wrong order for some articles
+
+#### Rating grids
+- Reviewing grids rating status were sometimes not mentioned in the grid list on article's management page
+- Reviewing grids editing: fixed incorrect display of criteria in multilingual reviewing grids
+
+#### Emails
+- Fixed an empty tag `%%SENDER_FULL_NAME%%` in "updated rating deadline" template.