Added project changelog

Signed-off-by: Julien Eluard <julien.eluard@gmail.com>

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- Added Farsi public #status channel
+- Spam moderation
+
+## [0.9.21] - 2018-06-25
+### Added
+- Mainnet is enabled by default on new installations. Upgrades will need to manually switch.
+- Chat now supports sending SNT and other tokens in 1-1 chats
+- New chat UI for /send and /receive commands
+- Updated chat message styling
+- Updated toolbar style
+- Updated DApp list
+- New help links on the Profile tab. Read our Beta FAQ, file a bug, or suggest and vote on features.
+- Performance improvements when fetching old messages
+- Added 5 new default public chats for our friends speaking Korean, Chinese, Japanese, Russian and Spanish.
+
+### Fixed
+- Prevented empty commands from being sent in chat
+- Fixed minimum amounts in transactions
+- Fixed an issue where contacts names may not be shown
+- Removed log files from release builds
+- Fixed an issue with transactions when navigating back