Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+### Added
+- Show additional message content (view once, remote delete, mention, …) for received messages
+- `--captcha` parameter for `register` command, required for some IP ranges
+
+### Changed
+- Profile keys are now stored separately from contact list
+- Receipts from normal and unidentified messages now have the same format in json output
+
+### Fixed
+- Issue where some messages were sent with an old counter index
+
+## Older
+
+Look at the [release tags](https://github.com/AsamK/signal-cli/releases) for information about older releases.