Added changelog

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

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]
+
+### Special operations
+These two operations couldn't be handled during migrations.
+They are optional, but you won't be able to search or get participant stats on existing events if they are not executed.
+These commands will be removed in Mobilizon 1.0.0-beta.3.
+
+In order to populate search index for existing events, you need to run the following command (with prod environment):
+* `mix mobilizon.setup_search`
+
+In order to move participant stats to the event table for existing events, you need to run the following command (with prod environment):
+* `mix mobilizon.move_participant_stats`
+
+### Added
+- Implement search engine & service in backend **(read special instructions above)**
+- Allow WebP and Gif pics upload
+- Optimize uploaded pics
+- Make tags clickable, redirecting to search
+- Add a different welcome message when coming from registration
+- Link to participation page from event page when you are an organizer
+- Added a warning on login that everything is deleted regularily
+- Updated Occitan translations (Quentin)
+- Updated French translations (Gavy, Zilverspar, ty kayn)
+- Updated Swedish translations (Anton Strömkvist)
+- Upgraded frontend and backend dependencies
+
+### Changed
+- Improve Docker setup and docs
+- Handle error message difference between user not found and user not confirmed
+- Upgrade vue-cli to v4, change the way server params injection is made
+- Limit length (20 characters) and number (10) of tags allowed
+- Added some backend changes and validation for field length
+- Improve some production ipv6 configuration
+- Move participant stats to event table **(read special instructions above)**
+
+### Fixed
+- Fix event URL validation and check if hostname is correct before showing it
+- Fix participations stats on the MyEvents page
+- Fix event description lists margin
+- Fix Cypress tests
+- Fix contribution guide link and improve contribution guide (Joel Takvorian)
+- Improve grammar (Damien)
+- Fix recursive alias in systemd unit file (Geno)
+- Fix multiline display on participants page
+- Add polyfill for IntersectionObserver so that it's usable on relatively old browsers
+- Fixed crash on Safari on description input by removing `-apple-system` from font-family
+- Improve installation docs (mkljczk)
+- Limit file uploads to 10MB
+- Added missing `setup_db.psql` file (Geno)
+- Fixed docker setup when using non-GNU make (JohanBaskovec)
+- Fixed actors deletion that didn't cascade to followers
+
+### Security
+- Sanitize event title to avoid XSS
+
+## [1.0.0-beta.1] - 2019-10-15
+### Added
+- Initial release