Add CHANGELOG.md with information about 0.2 and 0.1 releases

CHANGELOG.md

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+# Changelog
+
+All notable introduced and planned 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).
+
+## [0.2.0] - 2020-05-09
+
+### Added
+
+- Support for mount binding a crontab file so that the multiple regular rsync jobs (or just a single one) can be easier configured
+- Support for remote sync with ssh
+
+### Removed
+
+- Running a single scheduled rsync job using cron and passing the cron job string specification as an environment variable - use a mount binded crontab file
+- Passing the log file name as an environment variable - specify it now in the crontab file
+
+## [0.1.0] - 2020-04-12
+
+### Added
+
+- Run an ontime rsync job with local folders
+- Run an single scheduled rsync job using cron, provide the cron string as an environment variable
+- Save the output of rsync in a log file, provide the log file name as na environment variable