Add UPGRADE.md and CHANGELOG.md instructions for 2.0

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

CHANGELOG.md

@@ -4,6 +4,84 @@ 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).
 
+## 2.0.0 - unreleased
+
+### Added
+
+- Added possibility to follow groups and be notified from new upcoming events
+- Export list of participants to CSV, `PDF` and `ODS`
+- Allow to set timezone for an event. The timezone is automatically defined from the address if one is defined. If the event timezone is different than the user's current one, a toggle is shown to switch between the two.
+- Added initial support for Right To Left languages (such as arabic) and [BiDi](https://en.wikipedia.org/wiki/Bidirectional_text)
+- Build releases in `arm` and `arm64` format in addition to `amd64`
+- Build Docker images in `arm` and `arm64` format in addition to `amd64`
+- Added possibility to indicate the event is fully online
+- Added possibility to search only for online events
+- Added possibility to search only in past events
+- Detect event, comments and posts languages automatically. Allows setting language
+- Allow to change an user's password through the users.modify mix task
+- Add instance setting so that only the admin can create groups
+- Add instance setting so that only groups can create events
+- Added JSON-LD metadata about the event in emails
+- Added a quick link to email notification settings at the bottom of emails
+- Allow to access Mobilizon with a specific language directly by using `https://instance.tld/lang` where `lang` is a language supported by Mobilizon
+
+### Changed
+
+- Multiple UI improvements, including post, event and participation cards, discussions and emails. The « My Events » page was also redesigned to allow showing events from your groups.
+- Various accessibility improvements
+- Delete current actor ID as well from local storage when unlogging
+- Show a default text for instance contact in default terms text when no instance contact is set
+- Only show locatecontrol button in leaflet map when we can do geolocation
+- Disable push column in notification settings when push is not available
+- Show actual language instead of language code in Users admin view
+- Empty old & new passwords fields when successful password change
+- Don't link to the group page from admin when actor is suspended
+- Warn participants when the event organizer is suspended (and therefore the event cancelled)
+- Improve metadata on public page
+- Make sure some event action pages (participate remotely or without an account) don't get indexed by search engines
+- Only send `Tombstone` element in `Delete` activities, not the whole previous deleted element.
+- Only add address and tags to event icalendar export if they exist
+
+### Removed
+
+- Support for Elixir < 1.12 and OTP < 22
+
+### Fixed
+
+- Fix tags autocomplete
+- Fix config onboarding after LDAP initial connexion
+- Fix events pagination on tags page
+- Fixed deduplicated files from orphan media being deleted as well
+- Fix deleting own account
+- Fix search returning user profiles instead of only groups
+- Fix federating geo coordinates
+- Fix an issue with group activity items when moving resources
+- Fix an issue with Identity Picker
+- Fix an issue with TagInput
+- Fix an issue when leaving a group
+- Fix admin settings edition
+- Fix an issue when showing public page of suspended group
+- Removed non existing page (`/about/mobilizon`) from sitemap
+- Fix action logs containing group suspension events
+- Fixed group physical address not exposed to ActivityPub
+
+### Security
+
+- Fixed private messages sent as event replies from Mastodon that were shown publically as public comments. They are now discarded.
+### Translations
+
+- Czech
+- Gaelic
+- German
+- Indonesian
+- Norwegian Nynorsk
+- Occitan
+- Persian
+- Portuguese (Brazil)
+- Russian
+- Slovenian
+- Spanish
+
 ## 1.3.2 - 2021-08-23
 
 ### Fixed